CVE-2026-8958
HIGH severity · CVSS 8.6 · CWE-668
8.6CVSS HIGH
Summary
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
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/mfsa2026-46/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-48/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-50/Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-51/Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=2034713