Authentication Bypass Vulnerability in phpMyAdmin by phpMyAdmin Team
CVE-2026-119561

7.6HIGH

Key Information:

Vendor

PHPmyadmin
Status
PHPmyadmin
Vendor
CVE Published:
30 October 2026

What is CVE-2026-119561?

phpMyAdmin versions up to 5.2.3 are affected by an authentication bypass in the CustomServer component. This flaw arises from the failure to validate WebAuthn assertion signatures against stored public keys. Attackers possessing valid MySQL credentials could exploit this vulnerability by sending a crafted 'webauthn_request_response' that matches the challenge, origin, and rpIdHash, allowing them to bypass the second factor of authentication and gain unauthorized access to database privileges.

Affected Version(s)

phpMyAdmin 0 <= 5.2.3

References

https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2...
technical-description
https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA
third-party-advisory
https://abraxaslabs.tech/research/phpmyadmin-webauthn
third-party-advisory

CVSS V4

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Abraxas Labs
.