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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.
Reserved 2025-06-20 | Published 2025-06-24 | Updated 2025-06-24 | Assigner mozillaWebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate
Simon
bugzilla.mozilla.org/show_bug.cgi?id=1954033
www.mozilla.org/security/advisories/mfsa2025-51/
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