CVE-2025-8037 – Mozilla Cookie Secure Bypass

The following table lists the changes that have been made to the
CVE-2025-8037 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by [email protected]

    Jul. 22, 2025

    Action Type Old Value New Value
    Added 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 affects Firefox < 141, Firefox ESR < 140.1, Thunderbird < 141, and Thunderbird < 140.1.
    Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1964767
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-56/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-59/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-61/
    Added Reference https://www.mozilla.org/security/advisories/mfsa2025-63/
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