PatchSiren cyber security CVE debrief
CVE-2026-12316 Mozilla CVE debrief
A mitigation bypass vulnerability was discovered in the DOM: Security component. This issue was resolved in Firefox 152. Users are advised to update to the latest version to ensure their browser is secure.
- Vendor
- Mozilla
- Product
- Firefox
- CVSS
- CRITICAL 9.1
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-06-16
- Original CVE updated
- 2026-06-17
- Advisory published
- 2026-06-16
- Advisory updated
- 2026-06-17
Who should care
Users of Firefox, particularly those who use the browser for sensitive activities or in high-risk environments, should be aware of this vulnerability and take steps to update their browser.
Technical summary
The DOM: Security component in Firefox was found to have a mitigation bypass vulnerability. This could potentially allow attackers to bypass existing security measures.
Defensive priority
High
Recommended defensive actions
- Update Firefox to version 152 or later.
Evidence notes
The CVE was published on June 16, 2026, and the vendor, Mozilla, has provided advisories and patches for this issue.
Official resources
CVE-2026-12316 was published on 2026-06-16T13:16:32.257Z.