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5.4 Medium

CVE-2026-109763 Mitigation bypass in the File Handling component

Description

Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 158	earliest → < 158	158
Firefox 153.5	earliest → < 153.5	153.5
Thunderbird 158	earliest → < 158	158
Thunderbird 153.5	earliest → < 153.5	153.5

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published October 13, 2026
Last modified October 30, 2026

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