CVEvulnerability
CVE-2025-6433
9.8 CRITICAL
Official page ↗
- Status
- Modified
- Published
- 2025-06-24
- Last modified
- 2026-09-30
- Assigner
- [email protected]
- CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
- 9.8 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-295
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.
Affected configurations
• mozilla firefox (< 140.0)
Related
Weakness · CWE (1)
- CWE-295 Improper Certificate Validation weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1954033 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-54/ www.mozilla.org