Access Control Bypass Affecting Firefox package, versions [,140.0-beta1)
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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- published27 Jun 2025
- disclosed24 Jun 2025
- creditAlan Li (lebr0nli)
Introduced: 24 Jun 2025
NewCVE-2025-6427 (opens in a new tab)How to fix?
Upgrade Firefox to version 140.0-beta1 or higher.
Overview
Affected versions of this package are vulnerable to Access Control Bypass via manipulation of subdocuments in the connect-src Content Security Policy directive. An attacker can access restricted resources and conceal network connections from developer tools by exploiting this behavior.