GHSA-hmm7-jqq6-vwhrHighCVSS 6.8
phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer:...
🔗 CVE IDs covered (1)
📋 Description
phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer::parseAndValidateAssertionResponse() that never verifies WebAuthn assertion signatures against stored public keys. Attackers holding a victim's MySQL credentials can POST a crafted webauthn_request_response with matching challenge, origin, and rpIdHash to bypass the second factor and gain database privileges.
🔗 References (7)
- https://nvd.nist.gov/vuln/detail/CVE-2026-119561
- https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA
- https://abraxaslabs.tech/research/phpmyadmin-webauthn
- https://github.com/phpmyadmin/phpmyadmin
- https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.php#L76-L110
- https://www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authentication-bypass-via-customserver
- https://github.com/advisories/GHSA-hmm7-jqq6-vwhr