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ALSA-2025:4443 — Important: firefox security update

Affected: AlmaLinux:9: firefox, AlmaLinux:9: firefox-x11

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

Security Fix(es):

* firefox: thunderbird: Privilege escalation in Firefox Updater (CVE-2025-2817) * firefox: thunderbird: Unsafe attribute access during XPath parsing (CVE-2025-4087) * firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames (CVE-2025-4083) * firefox: thunderbird: Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10 (CVE-2025-4091) * firefox: thunderbird: Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10 (CVE-2025-4093)

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.

bdu:2025-10507

certfr-2025-avi-0358 — De multiples vulnérabilités ont été découvertes dans les produits Mozilla. Certaines d'entre elles permettent à un atta…

certfr-2025-avi-0358

EUVD-2026-290702

fkie_cve-2025-4091

Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.

GHSA-jgr2-rf9j-5fh3

Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Thunderbird < 138, and Thunderbird ESR < 128.10.

OESA-2025-1486 — firefox security update

Affected: openEuler:24.03-LTS: firefox

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance and portability. Security Fix(es):

Thunderbird's update mechanism allowed a medium-integrity user process to interfere with the SYSTEM-level updater by manipulating the file-locking behavior. By injecting code into the user-privileged process, an attacker could bypass intended access controls, allowing SYSTEM-level file operations on paths controlled by a non-privileged user and enabling privilege escalation. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10.(CVE-2025-2817)

A process isolation vulnerability in Thunderbird stemmed from improper handling of javascript: URIs, which could allow content to execute in the top-level document's process instead of the intended frame, potentially enabling a sandbox escape. This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10.(CVE-2025-4083)

Due to insufficient escaping of the special characters in the "copy as cURL" feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. *This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.* This vulnerability affects Firefox ESR < 128.10, Firefox ESR < 115.23, and Thunderbird < 12…

openSUSE-SU-2025:15042-1 — MozillaThunderbird-128.10.0-1.1 on GA media

MozillaThunderbird-128.10.0-1.1 on GA media

RHSA-2025:4751 — Red Hat Security Advisory: firefox security update

firefox: thunderbird: Privilege escalation in Firefox Updater firefox: thunderbird: Process isolation bypass using "javascript:" URI links in cross-origin frames firefox: thunderbird: Unsafe attribute access during XPath parsing firefox: thunderbird: Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10 firefox: thunderbird: Memory safety bug fixed in Firefox ESR 128.10 and Thunderbird 128.10

SUSE-SU-2025:1506-1 — Security update for MozillaThunderbird

Security update for MozillaThunderbird

UBUNTU-CVE-2025-4091

Affected: Ubuntu:18.04:LTS: mozjs52, Ubuntu:18.04:LTS: mozjs38, Ubuntu:20.04:LTS: mozjs68, Ubuntu:20.04:LTS: mozjs52, Ubuntu:22.04:LTS: mozjs102, Ubuntu:22.04:LTS: mozjs78, Ubuntu:22.04:LTS: mozjs91, Ubuntu:22.04:LTS: thunderbird, Ubuntu:24.04:LTS: mozjs102, Ubuntu:24.04:LTS: mozjs115

WID-SEC-W-2025-0901 — Mozilla Firefox, Firefox ESR, Thunderbird and Thunderbird ESR: Mehrere Schwachstellen

Ein entfernter, anonymer Angreifer kann mehrere Schwachstellenin Mozilla Firefox, Firefox ESR, Thunderbird und Thunderbird ESR ausnutzen, um seine Privilegien zu erhöhen, beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, einen Denial-of-Service-Zustand herbeizuführen, vertrauliche Informationen preiszugeben, Daten zu manipulieren oder andere nicht spezifizierte Angriffe durchzuführen.