CVE-2026-8962

Public on 2026-05-19
Modified on 2026-05-21
Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Severity
Medium severity
Medium
See what this means
CVSS v3 Base Score
4.2
See breakdown

Affected Packages

Platform Package Release Date Advisory Status
Amazon Linux 2 - Firefox Extra firefox 2026-06-08 ALAS2FIREFOX-2026-061 Fixed
Amazon Linux 2023 firefox 2026-06-08 ALAS2023-2026-1793 Fixed
Amazon Linux 2 - Core thunderbird 2026-06-08 ALAS2-2026-3340 Fixed

CVSS Scores

Score Type Score Vector
Amazon Linux CVSSv3 4.2 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-8962 Mitre: CVE-2026-8962