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9.1 Critical

CVE-2026-12304 Same-origin policy bypass in the Networking: Cookies component

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 152 earliest → < 152 152
Firefox 140.12 earliest → < 140.12 140.12
Thunderbird 152 earliest → < 152 152
Thunderbird 140.12 earliest → < 140.12 140.12

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118026 Invalid pointer in the JavaScript: GC component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High
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