Insertion of Sensitive Information Into Sent Data 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-14917195
- published13 Jan 2026
- disclosed13 Jan 2026
- creditEdgar Chen
Introduced: 13 Jan 2026
CVE-2026-0890 (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 Insertion of Sensitive Information Into Sent Data via the handling of Copy & Paste and Drag & Drop operations in the DOM. An attacker can mislead users by manipulating the displayed content or input data through crafted interactions.