CVE-2026-12304

CriticalCVSS 9.1/10Last modified Oct 26, 2026

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-346

Affected software

No affected versions have been published.

Timeline

Published: Jun 16, 2026
Last modified: Oct 26, 2026
NVD status: Analyzed

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