PT-2026-41920 · Mozilla · Firefox+1

Rintaro Kobayashi · Published 2026-05-19 · Updated 2026-05-27 · CVE-2026-8966

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Firefox versions prior to 151 Thunderbird versions prior to 151

Description Information disclosure occurs within the IP Protection component.

Recommendations Update Firefox to version 151. Update Thunderbird to version 151.

Fix

Information Disclosure

Weakness Enumeration

CWE-200

Related Identifiers

CVE-2026-8966

OPENSUSE-SU-2026:10863-1

Affected Products

Firefox

Thunderbird

References · 43

• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8966 · Vendor Advisory
• https://mozilla.org/en-US/security/advisories/mfsa2026-46/#CVE-2026-8966 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-8966 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2026:10863-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-8966 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-50 · Vendor Advisory
• https://mozilla.org/security/advisories/mfsa2026-46 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-8966 · Security Note
• https://suse.com/security/cve/CVE-2026-8958 · Note
• https://suse.com/security/cve/CVE-2026-8961 · Note
• https://suse.com/security/cve/CVE-2026-8951 · Note
• https://suse.com/security/cve/CVE-2026-8949 · Note
• https://suse.com/security/cve/CVE-2026-8959 · Note
• https://t.me/CVEtracker/54249 · Telegram Post
• https://suse.com/security/cve/CVE-2026-8962 · Note