CVE-2025-8037

firefox: thunderbird: Nameless cookies shadow secure cookies

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Severity

Moderate

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · July 23, 2025

Updated · June 30, 2026

Description

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.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE-614 · Sensitive Cookie in HTTPS Session Without 'Secure' Attribute