CVE-2026-8950
CRITICAL severity · CVSS 9.3 · CWE-346
9.3CVSS CRITICAL
Summary
Same-origin policy bypass in the Networking: HTTP 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 interactionRequired
Confidentiality impactHigh
Integrity impactHigh
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/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=1965430