Exposure of Sensitive Information to an Unauthorized Actor Affecting thunderbird package, versions [,153.6)[154,159)
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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Test your applications- Snyk IDSNYK-UNMANAGED-THUNDERBIRD-21755983
- published27 Oct 2026
- disclosed27 Oct 2026
- creditUnknown
Introduced: 27 Oct 2026
NewCVE-2026-118174 (opens in a new tab)How to fix?
Upgrade thunderbird to version 153.6, 159 or higher.
Overview
Affected versions of this package are vulnerable to Exposure of Sensitive Information to an Unauthorized Actor in the process of displaying messages containing OpenPGP key attachments. An attacker can cause arbitrary URLs to be loaded without user interaction by crafting an attachment marked as an external reference, which can bypass remote content blocking. On Windows systems, this can result in the leakage of NTLM credentials if the URL points to an attacker-controlled network share. This is only exploitable if the user is running the application on Windows and receives a specially crafted message with an external OpenPGP key attachment.