Medium severity6.8NVD Advisory· Published Oct 30, 2026
CVE-2026-119561
CVE-2026-119561
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.
Affected products
1- Range: <=5.2.3
Patches
Vulnerability mechanics
References
4- abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FAnvd
- abraxaslabs.tech/research/phpmyadmin-webauthnnvd
- github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.phpnvd
- www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authentication-bypass-via-customservernvd
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