Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150.
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://bugzilla.mozilla.org/show_bug.cgi?id=1880429
Source: Mitre, NVD
Published: 2026-04-21
Updated: 2026-04-21
Base Score: 7.5
Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P
Severity: High
Base Score: 6.5
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Severity: Medium
