Vulnerability in Mozilla Firefox
CVE-2026-12323
Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 152 and Thunderbird 152.
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L.
Affected products
- Mozilla Firefox — versions 152
- Mozilla Thunderbird — versions 152
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-12323?
- CVE-2026-12323 is a medium-severity vulnerability in Mozilla Firefox, classified under Improper Restriction of Rendered UI Layers or Frames (Clickjacking). CVSS score: 5.4/10. Published 2026-06-16.
- How severe is CVE-2026-12323?
- Medium severity. CVSS v3 base score is 5.4 out of 10.