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 affects Firefox < 140.
History

Thu, 03 Jul 2025 16:30:00 +0000

Type Values Removed Values Added
First Time appeared Mozilla
Mozilla firefox
CPEs cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
Vendors & Products Mozilla
Mozilla firefox

Thu, 26 Jun 2025 00:30:00 +0000

Type Values Removed Values Added
Title firefox: WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate
References
Metrics threat_severity

None

threat_severity

Low


Wed, 25 Jun 2025 13:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Tue, 24 Jun 2025 12:45:00 +0000

Type Values Removed Values Added
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 affects Firefox < 140.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published: 2025-06-24T12:28:04.065Z

Updated: 2025-06-25T12:41:50.340Z

Reserved: 2025-06-20T14:51:39.059Z

Link: CVE-2025-6433

cve-icon Vulnrichment

Updated: 2025-06-25T12:32:33.301Z

cve-icon NVD

Status : Analyzed

Published: 2025-06-24T13:15:24.327

Modified: 2025-07-03T16:04:41.260

Link: CVE-2025-6433

cve-icon Redhat

Severity : Low

Publid Date: 2025-06-24T12:28:04Z

Links: CVE-2025-6433 - Bugzilla