CVE-2026-119561

phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer

Published Oct 30, 2026 CVSS 4.0 · 7.6 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer
First Time appeared Phpmyadmin
Phpmyadmin phpmyadmin
Weaknesses CWE-347
CPEs cpe:2.3:a:phpmyadmin:phpmyadmin:*:*:*:*:*:*:*:*
Vendors & Products Phpmyadmin
Phpmyadmin phpmyadmin
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N'}

cvssV4_0

{'score': 7.6, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Oct 30, 2026, 4:21 PM
Reserved
Oct 30, 2026, 10:53 AM
Status
Analyzed
Published
Oct 30, 2026, 12:16 PM
Modified
Nov 3, 2026, 4:06 PM