Vulnerability in phpMyAdmin
CVE-2026-119561
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/… (technical-description)
- abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA (third-party-advisory)
- abraxaslabs.tech/research/phpmyadmin-webauthn (third-party-advisory)
- github.com/phpmyadmin/phpmyadmin (product)
- www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authe… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-119561?
- CVE-2026-119561 is a medium-severity vulnerability in phpMyAdmin, classified under Improper Verification of Cryptographic Signature. CVSS score: 6.8/10. Published 2026-10-30.
- How severe is CVE-2026-119561?
- Medium severity. CVSS v3 base score is 6.8 out of 10.