Description

An attacker was able to bypass the `connect-src` directive of a Content Security Policy by manipulating subdocuments. This would have also hidden the connections from the Network tab in Devtools. This vulnerability was fixed in Firefox 140 and Thunderbird 140.

INFO

Published Date :

2025-06-24T12:28:01.317Z

Last Modified :

2026-04-13T14:31:00.300Z

Source :

mozilla
AFFECTED PRODUCTS

The following products are affected by CVE-2025-6427 vulnerability.

Vendors Products
Mozilla
  • Firefox
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-6427.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1966927 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-6427 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-6427 cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-51/ cve-icon cve-icon cve-icon
https://www.mozilla.org/security/advisories/mfsa2025-54/ cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact