PT-2026-33965 · Mozilla · Thunderbird+1

Gary Kwong · Published 2026-04-21 · Updated 2026-04-27 · CVE-2026-6779

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

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

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

Description An issue exists in the JavaScript Engine component.

Recommendations Update Firefox to version 150. Update Thunderbird to version 150.

Fix

Buffer Overflow

XSS

RCE

Weakness Enumeration

CWE-119

CWE-79

CWE-20

Related Identifiers

BDU:2026-06956

CVE-2026-6779

OPENSUSE-SU-2026:10626-1

Affected Products

Firefox

Thunderbird

References · 54

• https://mozilla.org/security/advisories/mfsa2026-33 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-30 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06956 · Security Note
• https://ubuntu.com/security/CVE-2026-6779 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-30/#CVE-2026-6779 · 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://osv.dev/vulnerability/openSUSE-SU-2026:10626-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-6779 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-6779 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6779 · Vendor Advisory
• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-6779 · Security Note
• https://suse.com/security/cve/CVE-2026-6762 · Note
• https://suse.com/security/cve/CVE-2026-6760 · Note
• https://suse.com/security/cve/CVE-2026-6770 · Note