Improper Encoding or Escaping of Output Affecting thunderbird package, versions [,140.7.1)[141.0.0,147.0.1)
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-UNMANAGED-THUNDERBIRD-15182591
- published3 Feb 2026
- disclosed28 Jan 2026
- creditLeon Trampert, Daniel Weber, Christian Rossow, Michael Schwarz
Introduced: 28 Jan 2026
CVE-2026-0818 (opens in a new tab)How to fix?
Upgrade thunderbird to version 140.7.1, 147.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the rendering of remote content in partially encrypted emails. An attacker can access sensitive information by crafting emails that leverage CSS to exfiltrate the content of the unencrypted portions when remote content is permitted.