Critical severity9.1NVD Advisory· Published Jul 22, 2025· Updated Apr 13, 2026
CVE-2025-8037
CVE-2025-8037
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.
Affected products
4cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*+ 1 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <140.1
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <141.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*+ 1 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*range: <140.1
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*range: <141.0
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
5- www.mozilla.org/security/advisories/mfsa2025-56/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-59/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-61/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2025-63/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdPermissions Required
News mentions
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