Improper Restriction of Rendered UI Layers or Frames Affecting Firefox-ESR package, versions [,140.7.0)
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-FIREFOXESR-14917192
- published13 Jan 2026
- disclosed13 Jan 2026
- creditLyra Rebane
Introduced: 13 Jan 2026
CVE-2026-0887 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 140.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Improper Restriction of Rendered UI Layers or Frames via the PDF Viewer component. An attacker can trick users into interacting with hidden or disguised interface elements by embedding the affected component within a malicious website, potentially leading to unintended disclosure of sensitive information.