PT-2026-27422 · Mozilla · Firefox+1

Alex Gaynor + 6 · Published 2026-03-24 · Updated 2026-03-29 · CVE-2026-4724

Positive Technologies (AI Summary)

CVSS v3.1

9.1

Critical

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 149 Thunderbird versions prior to 149

Description An undefined behavior issue exists in the Audio/Video component. This can lead to unexpected program behavior.

Recommendations Update Firefox to version 149 or later. Update Thunderbird to version 149 or later.

Fix

Weakness Enumeration

CWE-758

Related Identifiers

CVE-2026-4724

OPENSUSE-SU-2026:10458-1

Affected Products

Firefox

Thunderbird

References · 61

• https://mozilla.org/en-US/security/advisories/mfsa2026-23 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-4724 · Security Note
• https://ubuntu.com/security/CVE-2026-4724 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-4724 · Security Note
• https://mozilla.org/security/advisories/mfsa2026-23 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-20 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10458-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-4724 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4724 · Security Note
• https://safe-surf.ru/specialists/bulletins-nkcki/730262 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-20/#CVE-2026-4724 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-20 · Vendor Advisory
• https://suse.com/security/cve/CVE-2026-4714 · Note
• https://suse.com/security/cve/CVE-2026-4700 · Note
• https://suse.com/security/cve/CVE-2026-4728 · Note