CVE-2026-39808 (GCVE-0-2026-39808)

Vulnerability from cvelistv5 – Published: 2026-04-14 15:38 – Updated: 2026-07-17 03:56
VLAI CISA Previdian
Summary
A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via <insert attack vector here>
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-04-14 00:00 UTC
CWE
  • CWE-78 - Execute unauthorized code or commands
Assigner
References
Impacted products
Vendor Product Version
Fortinet FortiSandbox Affected: 4.4.0 , ≤ 4.4.8 (semver)
    cpe:2.3:a:fortinet:fortisandbox:4.4.8:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.7:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.5:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandbox:4.4.0:*:*:*:*:*:*:*
Create a notification for this product.
Fortinet FortiSandbox PaaS Affected: 23.4.4374
Affected: 23.4.4350
Affected: 23.3.4329
Affected: 23.1.4245
Affected: 22.2.4151
Affected: 22.2.4134
Affected: 22.1.4113
Affected: 21.4.4072
Affected: 21.3.4055
    cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4374:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4350:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:23.3.4329:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:23.1.4245:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4151:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4134:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:22.1.4113:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:21.4.4072:*:*:*:*:*:*:*
    cpe:2.3:a:fortinet:fortisandboxpaas:21.3.4055:*:*:*:*:*:*:*
Create a notification for this product.
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4c565e69-3992-4624-900d-618827d36bf2

Vulnerability ID: CVE-2026-39808

Status: Confirmed

Status Updated: 2026-07-16 02:00 CEST

Exploited: Yes

Timestamps
First Seen: 2026-07-16
Asserted: 2026-07-16
Scope
Notes: Fortinet FortiSandbox OS Command Injection Vulnerability | Affected: Fortinet / FortiSandbox | Description: Fortinet FortiSandbox contains an OS command injection vulnerability that could allow an unauthenticated attacker to execute unauthorized code or commands via crafted HTTP requests. | Required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines. | Due date: 2026-07-19 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://fortiguard.fortinet.com/psirt/FG-IR-26-100 ; BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk ; Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk ; https://nvd.nist.gov/vuln/detail/CVE-2026-39808
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-78
Feed CISA Known Exploited Vulnerabilities Catalog
Product FortiSandbox
Due Date 2026-07-19
Date Added 2026-07-16
Vendorproject Fortinet
Vulnerabilityname Fortinet FortiSandbox OS Command Injection Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-10-02 08:09 CEST | Updated: 2026-10-02 08:09 CEST
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: fc31248f-ee2f-4374-9a78-60996bfd59b4

Vulnerability ID: CVE-2026-39808

Status: Confirmed

Status Updated: 2026-06-12 15:59 CEST

Exploited: Yes

Timestamps
First Seen: 2026-06-12
Asserted: 2026-06-12
Scope
Notes: A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through... | Affected: Fortinet / FortiSandbox, FortiSandbox PaaS | CVSS: 9.1 (CRITICAL) | EPSS: 0.47362 | Used in malware: unknown | Listed 34 days ahead of CISA KEV | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: previdian

Details
Feed Previdian (previdian.com)
Title A improper neutralization of special elements used in an os command ('os command injection') vulnerability in Fortinet FortiSandbox 4.4.0 through...
Cve Id CVE-2026-39808
Vendor Fortinet
Ghsa Id None
Product FortiSandbox, FortiSandbox PaaS
Added Date 2026-06-12T13:59:12.791Z
Cvss Score 9.1
Epss Score 0.47362
Previous Ids
Cvss Severity CRITICAL
Virtual Patch True
Cvss Estimated False
Epss Percentile 0.98804
Used In Malware unknown
Vulnerability Id CVE-2026-39808
Ahead Of Cisa Kev 
{
  "count": 34,
  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-10-02 09:09 CEST | Updated: 2026-10-02 09:09 CEST
Show details on NVD website
To clipboard 

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        ],
        "cna": {
          "affected": [
            {
              "cpes": [
                "cpe:2.3:a:fortinet:fortisandbox:4.4.8:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.7:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.6:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.5:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.4:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.3:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.2:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.1:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandbox:4.4.0:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "product": "FortiSandbox",
              "vendor": "Fortinet",
              "versions": [
                {
                  "lessThanOrEqual": "4.4.8",
                  "status": "affected",
                  "version": "4.4.0",
                  "versionType": "semver"
                }
              ]
            },
            {
              "cpes": [
                "cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4374:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:23.4.4350:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:23.3.4329:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:23.1.4245:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4151:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:22.2.4134:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:22.1.4113:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:21.4.4072:*:*:*:*:*:*:*",
                "cpe:2.3:a:fortinet:fortisandboxpaas:21.3.4055:*:*:*:*:*:*:*"
              ],
              "defaultStatus": "unaffected",
              "product": "FortiSandbox PaaS",
              "vendor": "Fortinet",
              "versions": [
                {
                  "status": "affected",
                  "version": "23.4.4374"
                },
                {
                  "status": "affected",
                  "version": "23.4.4350"
                },
                {
                  "status": "affected",
                  "version": "23.3.4329"
                },
                {
                  "status": "affected",
                  "version": "23.1.4245"
                },
                {
                  "status": "affected",
                  "version": "22.2.4151"
                },
                {
                  "status": "affected",
                  "version": "22.2.4134"
                },
                {
                  "status": "affected",
                  "version": "22.1.4113"
                },
                {
                  "status": "affected",
                  "version": "21.4.4072"
                },
                {
                  "status": "affected",
                  "version": "21.3.4055"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "A improper neutralization of special elements used in an os command (\u0027os command injection\u0027) vulnerability in Fortinet FortiSandbox 4.4.0 through 4.4.8 may allow attacker to execute unauthorized code or commands via \u003cinsert attack vector here\u003e"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.1,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:F/RL:O/RC:C",
                "version": "3.1"
              },
              "format": "CVSS"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-78",
                  "description": "Execute unauthorized code or commands",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-04-14T15:38:02.089Z",
            "orgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
            "shortName": "fortinet"
          },
          "references": [
            {
              "name": "https://fortiguard.fortinet.com/psirt/FG-IR-26-100",
              "url": "https://fortiguard.fortinet.com/psirt/FG-IR-26-100"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "value": "Upgrade to FortiSandbox version 4.4.9 or above\nUpgrade to FortiSandbox PaaS version 5.0.2 or above"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "6abe59d8-c742-4dff-8ce8-9b0ca1073da8",
        "assignerShortName": "fortinet",
        "cveId": "CVE-2026-39808",
        "datePublished": "2026-04-14T15:38:02.089Z",
        "dateReserved": "2026-04-07T15:24:03.838Z",
        "dateUpdated": "2026-07-17T03:56:21.793Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.