Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://www.mozilla.org/security/advisories/mfsa2026-46/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-50/ Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 9.1 · mozillaNVD modified 2026-10-14 20:10
Affected (CPE criteria) 2
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
References 6
- https://bugzilla.mozilla.org/show_bug.cgi?id=2038803 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-46/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-50/ Vendor Advisory
- https://access.redhat.com/security/cve/CVE-2026-8948
- https://bugzilla.redhat.com/show_bug.cgi?id=2479850
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8948.json