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CVE-2025-8037

Published: Jul 22, 2025

Modified: Apr 13, 2026

PUBLISHED

Description

Setting a nameless cookie with an equals sign in the value shadowed other cookies. Even if the nameless cookie was set over HTTP and the shadowed cookie included the `Secure` attribute. This vulnerability was fixed in Firefox 141, Firefox ESR 140.1, Thunderbird 141, and Thunderbird 140.1.

Vendor	Product	Versions
Mozilla	Firefox	unaffected `140.1 - <= 140.` unaffected `141 - <= `
Mozilla	Thunderbird	unaffected `140.1 - <= 140.` unaffected `141 - <= `

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1964767

https://www.mozilla.org/security/advisories/mfsa2025-56/

https://www.mozilla.org/security/advisories/mfsa2025-59/

https://www.mozilla.org/security/advisories/mfsa2025-61/

https://www.mozilla.org/security/advisories/mfsa2025-63/

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