Bug 2382719 (CVE-2025-8037)

Summary: CVE-2025-8037 firefox: thunderbird: Nameless cookies shadow secure cookies
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gotiwari, jhorak, mvyas, tpopela
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue: Setting a nameless cookie with an equals sign in the value shadows other cookies. Even if the nameless cookie was set over HTTP, and the shadowed cookie included the <code>Secure</code> attribute.
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Description OSIDB Bzimport 2025-07-22 21:02:43 UTC
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 affects Firefox < 141, Firefox ESR < 140.1, Thunderbird < 141, and Thunderbird < 140.1.