CVE-2026-109783

Mitigation bypass in the File Handling component

State: Published
Severity: 8.3 High
Published: Oct 13, 2026
Updated: Oct 26, 2026
Reserved: Oct 13, 2026

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox ESR 153.5 and Thunderbird 153.5.

Scores

CVSS	Score	Vector	Source
3.1	8.3 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-693 Protection Mechanism Failure

Affected Products

Product	Versions
FirefoxMozilla	153.5 and laterNot affected
ThunderbirdMozilla	153.5 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2075533
https://www.mozilla.org/security/advisories/mfsa2026-108/
https://www.mozilla.org/security/advisories/mfsa2026-110/

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