CVE-2026-119561NVD

Vulnerability Summary

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.

Severity Level

HIGH(7.6)

Published Date

Oct 30, 2026

Last Modified

Oct 30, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

0.19%Probability

Root Weakness (CWE)

CWE-347: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v4.0 Base Metrics — Score 7.6 (HIGH)

Attack VectorNetwork

Attack ComplexityHigh

Attack RequirementsPresent

Privileges RequiredLow

User InteractionNone

Confidentiality (Vulnerable System)High

Integrity (Vulnerable System)High

Availability (Vulnerable System)None

Confidentiality (Subsequent System)None

Integrity (Subsequent System)None

Availability (Subsequent System)None

CVSS v3.1 Base Metrics — Score 6.8 (MEDIUM)

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

Affected & Patched Versions

Affected Versions

phpMyAdmin phpMyAdmin <= 5.2.3

Patched Versions

phpMyAdmin phpMyAdmin 5.2.3

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