Description

If a user visited a webpage with an invalid TLS certificate, and granted an exception, the webpage was able to provide a WebAuthn challenge that the user would be prompted to complete. This is in violation of the WebAuthN spec which requires "a secure transport established without errors". This vulnerability was fixed in Firefox 140 and Thunderbird 140.

INFO

Published Date :

2025-06-24T12:28:04.065Z

Last Modified :

2026-04-13T14:31:09.599Z

Source :

mozilla
AFFECTED PRODUCTS

The following products are affected by CVE-2025-6433 vulnerability.

Vendors Products
Mozilla
  • Firefox
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-6433.

URL Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1954033 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-6433 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-6433 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