Vulnerability-Lookup

RHSA-2026:68549

Vulnerability from csaf_opensuse - Published: 2026-09-17 08:11 - Updated: 2026-10-01 23:41

Summary

Red Hat Security Advisory: firefox security update

Severity

Important

Notes

Topic: An update for firefox is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability. Security Fix(es): * firefox: thunderbird: Privilege escalation in the DOM: Workers component (CVE-2026-16365) * firefox: thunderbird: Sandbox escape in the Remote Settings Client component (CVE-2026-75874) * firefox: Sandbox escape due to use-after-free in the DOM: Security component (CVE-2026-84121) * firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40 (CVE-2026-84145) * firefox: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-84119) * firefox: Use-after-free in the Audio/Video component (CVE-2026-84120) * firefox: Privilege escalation due to invalid pointer in the Graphics component (CVE-2026-84131) * firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-84124) * firefox: Use-after-free in the Audio/Video component (CVE-2026-84122) * firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15 (CVE-2026-84143) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-16365

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation in the DOM: Workers component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-266 - Incorrect Privilege Assignment

Affected products

Fixed 13 products

Product	Version	Remediation
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.src	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.aarch64	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.s390x	—	Vendor Fix fix
Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.x86_64	—	Vendor Fix fix

Threats

Impact Important

CVE-2026-75874

A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape in the Remote Settings Client component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-653 - Improper Isolation or Compartmentalization

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84119

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Navigation component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84120

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Audio/Video component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84121

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Sandbox escape due to use-after-free in the DOM: Security component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84122

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the Audio/Video component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84124

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Use-after-free in the DOM: Core & HTML component

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84131

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Privilege escalation due to invalid pointer in the Graphics component

6.1 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Moderate

CVE-2026-84143

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Internally found bugs present in Firefox 154, Firefox ESR 153.1 and Firefox ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-787 - Out-of-bounds Write

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

CVE-2026-84145

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: Internally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR 115.39. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 13 products, the same list as for CVE-2026-16365

Threats

Impact Important

References

78 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:68549	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2503504	external
https://bugzilla.redhat.com/show_bug.cgi?id=2517832	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526753	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526760	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526764	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526765	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526767	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526773	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526778	external
https://bugzilla.redhat.com/show_bug.cgi?id=2526781	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-16365	self
https://bugzilla.redhat.com/show_bug.cgi?id=2503504	external
https://www.cve.org/CVERecord?id=CVE-2026-16365	external
https://nvd.nist.gov/vuln/detail/CVE-2026-16365	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-75874	self
https://bugzilla.redhat.com/show_bug.cgi?id=2517832	external
https://www.cve.org/CVERecord?id=CVE-2026-75874	external
https://nvd.nist.gov/vuln/detail/CVE-2026-75874	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84119	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526764	external
https://www.cve.org/CVERecord?id=CVE-2026-84119	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84119	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84120	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526765	external
https://www.cve.org/CVERecord?id=CVE-2026-84120	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84120	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84121	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526753	external
https://www.cve.org/CVERecord?id=CVE-2026-84121	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84121	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84122	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526778	external
https://www.cve.org/CVERecord?id=CVE-2026-84122	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84122	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84124	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526773	external
https://www.cve.org/CVERecord?id=CVE-2026-84124	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84124	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84131	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526767	external
https://www.cve.org/CVERecord?id=CVE-2026-84131	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84131	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84143	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526781	external
https://www.cve.org/CVERecord?id=CVE-2026-84143	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84143	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://access.redhat.com/security/cve/CVE-2026-84145	self
https://bugzilla.redhat.com/show_bug.cgi?id=2526760	external
https://www.cve.org/CVERecord?id=CVE-2026-84145	external
https://nvd.nist.gov/vuln/detail/CVE-2026-84145	external
https://www.mozilla.org/security/advisories/mfsa2…	external
https://www.mozilla.org/security/advisories/mfsa2…	external

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      "cve": "CVE-2026-84145",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-09-01T12:42:33.455531+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2526760"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Firefox. The Mozilla Foundation\u0027s Security Advisory describes the following issue:\nInternally found bugs present in Firefox 154, Firefox ESR 153.1, Firefox ESR 140.14 and Firefox ESR 115.39. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.aarch64",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.ppc64le",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.s390x",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.src",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.x86_64",
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          "AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.s390x",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.x86_64",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.aarch64",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.ppc64le",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.s390x",
          "AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-84145"
        },
        {
          "category": "external",
          "summary": "RHBZ#2526760",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2526760"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-84145",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-84145"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-84145",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84145"
        },
        {
          "category": "external",
          "summary": "https://www.mozilla.org/security/advisories/mfsa2026-84/#CVE-2026-84145",
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-84/#CVE-2026-84145"
        },
        {
          "category": "external",
          "summary": "https://www.mozilla.org/security/advisories/mfsa2026-87/#CVE-2026-84145",
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-87/#CVE-2026-84145"
        }
      ],
      "release_date": "2026-09-01T12:18:43.808000+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-17T08:11:32+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:68549"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.aarch64",
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.ppc64le",
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.src",
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-0:140.15.0-1.el8_10.x86_64",
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.aarch64",
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            "AppStream-8.10.0.Z.MAIN.EUS:firefox-debuginfo-0:140.15.0-1.el8_10.s390x",
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            "AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.s390x",
            "AppStream-8.10.0.Z.MAIN.EUS:firefox-debugsource-0:140.15.0-1.el8_10.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40"
    }
  ]
}

CVE-2026-16365 (GCVE-0-2026-16365)

Vulnerability from cvelistv5 – Published: 2026-07-21 12:37 – Updated: 2026-09-01 21:44

Title

Privilege escalation in the DOM: Workers component

Summary

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-24 03:55 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-284 - Improper Access Control

Assigner

mozilla mitre root Scorecard

References

5 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2049149
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153 , ≤ * (rpm)

Credits

Khanh Nguyen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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        ],
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            ]
          },
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            "descriptions": [
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                "description": "CWE-284 Improper Access Control",
                "lang": "en",
                "type": "CWE"
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            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-07-24T20:16:53.217Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "140.*",
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      ],
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        {
          "lang": "en",
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        }
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              "base64": false,
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            }
          ],
          "value": "Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15."
        }
      ],
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        "dateUpdated": "2026-09-01T21:44:09.484Z",
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    "state": "PUBLISHED"
  },
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}

CVE-2026-75874 (GCVE-0-2026-75874)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-09-01 21:44

Title

Sandbox escape in the Remote Settings Client component

Summary

Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.

Severity

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 19:23 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

mozilla mitre root Scorecard

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2039972
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

crixer

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseScore": 10,
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              "confidentialityImpact": "HIGH",
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              "scope": "CHANGED",
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                "id": "CVE-2026-75874",
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                    "Technical Impact": "total"
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          "dateUpdated": "2026-08-18T19:24:04.720Z",
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            }
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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-83/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-84/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-85/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-87/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-88/"
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    "datePublished": "2026-08-18T12:23:35.478Z",
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CVE-2026-84119 (GCVE-0-2026-84119)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Sandbox escape due to use-after-free in the DOM: Navigation component

Summary

Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root Scorecard

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2057817
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Yaqoub Aldurayhim

Show details on NVD website

JSON

To clipboard

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  "containers": {
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        "metrics": [
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            }
          ],
          "value": "Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2."
        }
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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-83/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-84/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-85/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-86/"
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        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-88/"
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      ],
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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}

CVE-2026-84120 (GCVE-0-2026-84120)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-01 21:44

Title

Use-after-free in the Audio/Video component

Summary

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 13:47 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root Scorecard

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2058911
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Ukyo Akai

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
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          "value": "Ukyo Akai"
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            }
          ],
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          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2058911"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-82/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-83/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-84/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-85/"
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        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-86/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-88/"
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      ],
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CVE-2026-84121 (GCVE-0-2026-84121)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Sandbox escape due to use-after-free in the DOM: Security component

Summary

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root Scorecard

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2059018
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Yaqoub Aldurayhim

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "baseSeverity": "CRITICAL",
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              "content": {
                "id": "CVE-2026-84121",
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            }
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-83/"
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CVE-2026-84122 (GCVE-0-2026-84122)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-01 21:44

Title

Use-after-free in the Audio/Video component

Summary

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 15:10 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root Scorecard

References

7 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2059965
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Hyeonjun Ahn

Show details on NVD website

JSON

To clipboard

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    "adp": [
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        "metrics": [
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              "attackVector": "NETWORK",
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CVE-2026-84124 (GCVE-0-2026-84124)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-01 21:44

Title

Use-after-free in the DOM: Core & HTML component

Summary

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 15:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla mitre root Scorecard

References

7 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2061110
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Hyeonjun Ahn

Show details on NVD website

JSON

To clipboard

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CVE-2026-84131 (GCVE-0-2026-84131)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Privilege escalation due to invalid pointer in the Graphics component

Summary

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-763 - Release of Invalid Pointer or Reference

Assigner

mozilla mitre root Scorecard

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2060008
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

navapon

Show details on NVD website

JSON

To clipboard

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CVE-2026-84143 (GCVE-0-2026-84143)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:19 – Updated: 2026-09-03 17:23

Title

Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15

Summary

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-03 17:14 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

mozilla mitre root Scorecard

References

9 references

URL	Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/show_bug.cgi?id=2057108
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Jan de Mooij, Tom Ritter and the Mozilla Fuzzing Team

Show details on NVD website

JSON

To clipboard

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              "value": "Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2."
            }
          ],
          "value": "Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2."
        }
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          "name": "Low Severity internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15",
          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2057108"
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        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-84/"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-85/"
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        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-88/"
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      ],
      "title": "Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15"
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  "cveMetadata": {
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    "datePublished": "2026-09-01T12:19:10.109Z",
    "dateReserved": "2026-09-01T07:26:01.305Z",
    "dateUpdated": "2026-09-03T17:23:35.483Z",
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CVE-2026-84145 (GCVE-0-2026-84145)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15

Summary

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Assigner

mozilla mitre root Scorecard

References

10 references

URL	Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/show_bug.cgi?id=2055678
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Leo Tenenbaum, Tom Ritter and the Mozilla Fuzzing Team

Show details on NVD website

JSON

To clipboard

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              "attackVector": "NETWORK",
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              "baseScore": 7.5,
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              "confidentialityImpact": "HIGH",
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              "scope": "UNCHANGED",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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