Cleartext Transmission of Sensitive Information Affecting thunderbird package, versions [,158.0.1)
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-21280768
- published20 Oct 2026
- disclosed20 Oct 2026
- creditUnknown
Introduced: 20 Oct 2026
NewCVE-2026-113866 (opens in a new tab)How to fix?
Upgrade thunderbird to version 158.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Cleartext Transmission of Sensitive Information due to the AutoDiscover process transmitting user credentials over plain HTTP. An attacker can intercept sensitive information by performing a man-in-the-middle attack on the network during account setup.