Improper Enforcement of Message Integrity During Transmission in a Communication Channel Affecting thunderbird package, versions [,140.14)[141.0,153.1)
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-19427696
- published29 Aug 2026
- disclosed18 Aug 2026
- creditUnknown
Introduced: 18 Aug 2026
NewCVE-2026-74962 (opens in a new tab)How to fix?
Upgrade thunderbird to version 140.14, 153.1 or higher.
Overview
Affected versions of this package are vulnerable to Improper Enforcement of Message Integrity During Transmission in a Communication Channel through improper enforcement of site isolation in the Cookies component. An attacker can access or manipulate data from other sites by exploiting cross-site interactions.