CVE-2026-12304 is a vulnerability in Mozilla Firefox
Published on June 16, 2026
Same-origin policy bypass in the Networking: Cookies component
Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
Products Associated with CVE-2026-12304
Want to know whenever a new CVE is published for Mozilla Firefox? stack.watch will email you.
Affected Versions
Mozilla Firefox:- Version 140.12, <= 140.* is unaffected.
- Version 152, <= * is unaffected.