Exposure of Sensitive System Information to an Unauthorized Control Sphere Affecting Firefox-ESR package, versions [,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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- published26 Feb 2026
- disclosed24 Feb 2026
- creditUnknown
Introduced: 24 Feb 2026
CVE-2026-2783 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 140.8 or higher.
Overview
Affected versions of this package are vulnerable to Exposure of Sensitive System Information to an Unauthorized Control Sphere in the JIT component of the JavaScript engine. An attacker can access sensitive information by enticing a user to visit a malicious web page, which triggers miscompilation and unintended data exposure.