CVE-2026-8948

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Score

CVSS 3.1 9.1 Critical

Status

Modified - security@mozilla.org

Published

2026-05-19

Last modified

2026-10-14

Weaknesses

CWE-79, CWE-942

Affected products

• Firefox (Mozilla)
• Thunderbird (Mozilla)
• Enterprise Linux (Redhat)

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=2038803
• https://www.mozilla.org/security/advisories/mfsa2026-46/
• https://www.mozilla.org/security/advisories/mfsa2026-50/
• 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