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9.6 Critical

CVE-2026-100804 Sandbox escape due to use-after-free in the Preferences: Backend component

Description

Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 157	earliest → < 157	157
Thunderbird 157	earliest → < 157	157

References

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

Timeline

Published September 29, 2026
Last modified September 30, 2026

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