Improper Authentication Affecting thunderbird package, versions [,140.1)[141.0-b1,141.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published24 Jul 2025
- disclosed22 Jul 2025
- creditUku Sõrmus
Introduced: 22 Jul 2025
NewCVE-2025-8037 (opens in a new tab)How to fix?
Upgrade thunderbird to version 140.1, 141.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Authentication via the handling of cookies when a nameless cookie containing an equals sign in its value is set. An attacker can override existing cookies, including those with the Secure attribute, by setting a specially crafted nameless cookie over HTTP.