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9.8 Critical

CVE-2026-92066 Sandbox escape in the Profile Backup component

Description

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 156 and Thunderbird 156.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 156	earliest → < 156	156
Thunderbird 156	earliest → < 156	156

References

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

Timeline

Published September 15, 2026
Last modified September 21, 2026

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