CVE-2025-6433 (GCVE-0-2025-6433)

Vulnerability from cvelistv5 – Published: 2025-06-24 12:28 – Updated: 2025-10-30 16:13
VLAI?
Title
WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certificate
Summary
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 and Thunderbird < 140.
Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-295 - Improper Certificate Validation
Assigner
References
Impacted products
Vendor Product Version
Mozilla Firefox Affected: unspecified , < 140 (custom)
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    Mozilla Thunderbird Affected: unspecified , < 140 (custom)
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Credits
Simon
Show details on NVD website
To clipboard 

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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