PT-2026-33941 · Mozilla · Firefox+1

Paranoidmoth · Published 2026-04-21 · Updated 2026-04-27 · CVE-2026-6755

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 150 Thunderbird versions prior to 150

Description A mitigation bypass exists in the DOM postMessage component.

Recommendations Update to version 150 or later.

Fix

CSRF

Weakness Enumeration

CWE-352

Related Identifiers

CVE-2026-6755

OPENSUSE-SU-2026:10626-1

Affected Products

Firefox

Thunderbird

References · 54

• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6755 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10626-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6755 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-30 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-6755 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6755 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-6755 · Security Note
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6755 · Security Note
• https://suse.com/security/cve/CVE-2026-6777 · Note
• https://suse.com/security/cve/CVE-2026-6746 · Note
• https://suse.com/security/cve/CVE-2026-6769 · Note
• https://twitter.com/VulmonFeeds/status/2046661495744790563 · Twitter Post