CVE-2026-100787
CRITICAL severity · CVSS 9.6 · Improper input validation
9.6CVSS CRITICAL
Summary
Sandbox escape in the XUL component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Affected products we track (2)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Additional information
- NVD record
- https://www.mozilla.org/security/advisories/mfsa2026-100/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-101/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-103/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-97/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2071068