CVE-2026-109704

Privilege escalation in the Application Update component

State: Published
Severity: 8.8 High
Published: Oct 13, 2026
Updated: Oct 14, 2026
Reserved: Oct 13, 2026

Description

Privilege escalation in the Application Update component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Scores

CVSS	Score	Vector	Source
3.1	8.8 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-269 Improper Privilege Management

Affected Products

Product	Versions
FirefoxMozilla	153.5 through 153.*Not affected 158 and laterNot affected
ThunderbirdMozilla	153.5 through 153.*Not affected 158 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2037979
https://www.mozilla.org/security/advisories/mfsa2026-106/
https://www.mozilla.org/security/advisories/mfsa2026-108/
https://www.mozilla.org/security/advisories/mfsa2026-109/
https://www.mozilla.org/security/advisories/mfsa2026-110/

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