Bug 2374567 (CVE-2025-6433) - CVE-2025-6433 firefox: WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate
Summary: CVE-2025-6433 firefox: WebAuthn would allow a user to sign a challenge on a w...
Keywords:
Status: NEW
Alias: CVE-2025-6433
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
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Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2025-06-24 13:01 UTC by OSIDB Bzimport
Modified: 2025-06-25 12:41 UTC (History)
5 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2025-06-24 13:01:52 UTC 
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.
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