CVE-2026-12304
Public on 2026-06-16
Modified on 2026-06-19
Description
Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
CVSS v3 Base Score
See breakdown
Affected Packages
| Platform | Package | Release Date | Advisory | Status |
|---|---|---|---|---|
| Amazon Linux 2 - Firefox Extra | firefox | 2026-07-08 | ALAS2FIREFOX-2026-062 | Fixed |
| Amazon Linux 2023 | firefox | 2026-07-07 | ALAS2023-2026-1928 | Fixed |
| Amazon Linux 2 - Firefox Extra | firefox-amzn-policies-generic | Not Affected | ||
| Amazon Linux 2 - Core | thunderbird | 2026-07-08 | ALAS2-2026-3795 | Fixed |
CVSS Scores
| Score Type | Score | Vector | |
|---|---|---|---|
| Amazon Linux | CVSSv3 | 8.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N |