CVE-2026-119561phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer

Descripción

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.

Datos: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Se publican tal como los indican las fuentes, en inglés.

Productos y versiones afectados

Referencias y parches

• https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.php#L76-L110 technical-descriptionProduct
• https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA third-party-advisoryExploitMitigationThird Party Advisory
• https://abraxaslabs.tech/research/phpmyadmin-webauthn third-party-advisoryExploitThird Party Advisory
• https://github.com/phpmyadmin/phpmyadmin productProduct
• VulnCheck Advisory: phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer third-party-advisoryExploitThird Party Advisory