Security Advisory

CVE-2025-6433

CVE vulnerability detail — eXtreme Datacenter Security Operations

Published 2025-06-24 12:28:04

Last updated 2026-04-13 14:31:09

Assigner mozilla

State PUBLISHED

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 was fixed in Firefox 140 and Thunderbird 140.

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