CVE-2026-100829

CriticalCVSS 9.6/10Last modified Oct 13, 2026

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-693

Affected software

Vendor	Product	Versions
Mozilla	Firefox	—
Mozilla	Thunderbird	—

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2066321Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-100/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-101/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-103/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-97/Vendor Advisory

Timeline

Published: Sep 29, 2026
Last modified: Oct 13, 2026
NVD status: Analyzed

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