Improper Restriction of Communication Channel to Intended Endpoints Affecting thunderbird package, versions [,153.0)
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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Test your applications- Snyk IDSNYK-UNMANAGED-THUNDERBIRD-18302661
- published25 Jul 2026
- disclosed21 Jul 2026
- creditUnknown
Introduced: 21 Jul 2026
CVE-2026-16398 (opens in a new tab)How to fix?
Upgrade thunderbird to version 153.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Restriction of Communication Channel to Intended Endpoints through improper enforcement of site isolation in the Graphics component. An attacker can access or manipulate data across different sites by exploiting the lack of proper process separation.