Protection Mechanism Failure Affecting Firefox package, versions [,150.0.3)
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-FIREFOX-16668531
- published14 May 2026
- disclosed12 May 2026
- creditggwhyp
Introduced: 12 May 2026
CVE-2026-8401 (opens in a new tab)How to fix?
Upgrade Firefox to version 150.0.3 or higher.
Overview
Affected versions of this package are vulnerable to Protection Mechanism Failure through the Profile Backup process. An attacker can execute code outside of the intended sandbox by exploiting insufficient isolation between the sandboxed environment and the host system.