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8.3 High

CVE-2026-109783 Mitigation bypass in the File Handling component

Description

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

Affected products and versions

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

Timeline

Published October 13, 2026
Last modified October 26, 2026

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