PT-2026-33941 · Mozilla · Firefox

Paranoidmoth · Published 2026-04-21 · Updated 2026-04-21 · CVE-2026-6755

NVD

CVSS v3.1

6.5

Medium

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Mitigation bypass in the DOM: postMessage component. This vulnerability was fixed in Firefox 150.

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-6755

Affected Products

Firefox

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-6755 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• https://bugzilla.mozilla.org/show_bug.cgi?id=1880429 · Note