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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

References

Timeline

  1. Published
  2. Last modified

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