Exposure of Resource to Wrong Sphere Affecting Firefox-ESR package, versions [,128.12)
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-10558112
- published27 Jun 2025
- disclosed24 Jun 2025
- creditMasato Kinugawa
Introduced: 24 Jun 2025
NewCVE-2025-6429 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 128.12 or higher.
Overview
Affected versions of this package are vulnerable to Exposure of Resource to Wrong Sphere via incorrect parsing of URLs in the embed tag. An attacker can bypass domain-based security restrictions by crafting a malicious URL that is rewritten to an unintended domain.