Improper Isolation or Compartmentalization Affecting Firefox-ESR package, versions [,115.33)[128.0,140.8)
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-FIREFOXESR-15353633
- published26 Feb 2026
- disclosed24 Feb 2026
- creditUnknown
Introduced: 24 Feb 2026
CVE-2026-2761 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 115.33, 140.8 or higher.
Overview
Affected versions of this package are vulnerable to Improper Isolation or Compartmentalization through the WebRender component. An attacker can execute arbitrary code outside of the intended sandbox by enticing a user to visit a specially crafted web page.