CVE-2025-6433

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.

• CWE-295

• https://bugzilla.mozilla.org/show_bug.cgi?id=1954033Permissions Required
• https://www.mozilla.org/security/advisories/mfsa2025-51/Vendor Advisory
• https://www.mozilla.org/security/advisories/mfsa2025-54/

Published

Jun 24, 2025

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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