PT-2026-41918 · Mozilla · Firefox+1

Satoki Tsuji · Published 2026-05-19 · Updated 2026-05-27 · CVE-2026-8964

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

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

Description A spoofing issue exists within the Popup Blocker component.

Recommendations Update to version 151.

Fix

UI Misrepresentation of Critical Information

Weakness Enumeration

CWE-451

Related Identifiers

CVE-2026-8964

OPENSUSE-SU-2026:10863-1

Affected Products

Firefox

Thunderbird

References · 42

• https://ubuntu.com/security/CVE-2026-8964 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-8964 · Security Note
• https://mozilla.org/en-US/security/advisories/mfsa2026-46/#CVE-2026-8964 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10863-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-8964 · 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-2026-8964 · Security Note
• https://bugzilla.mozilla.org/show_bug.cgi?id=2025170 · 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://twitter.com/CVEnew/status/2056870254484099329 · Twitter Post