CVE-2026-92066

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

Score

CVSS 3.1 9.8 Critical

Status

Analyzed - security@mozilla.org

Published

2026-09-15

Last modified

2026-10-05

Weaknesses

CWE-693

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2058093
• https://www.mozilla.org/security/advisories/mfsa2026-90/
• https://www.mozilla.org/security/advisories/mfsa2026-94/