Improper Input Validation Affecting thunderbird package, versions [,154)
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-20886670
- published13 Oct 2026
- disclosed13 Oct 2026
- creditUnknown
Introduced: 13 Oct 2026
NewCVE-2026-84637 (opens in a new tab)How to fix?
Upgrade thunderbird to version 154 or higher.
Overview
Affected versions of this package are vulnerable to Improper Input Validation through the handling of calendar invitation attachments using file URIs. An attacker can execute arbitrary local or network-hosted executables by sending a specially crafted calendar invitation, potentially bypassing normal protections and displaying misleading filenames to the user.