CVE-2026-119561
highphpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer::parseAndValidateAssertionResponse() that never verifies WebAuthn asse…
Vendor / product: Phpmyadmin — phpmyadmin
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.
CVSS
8.1
8.1 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2026-10-30 12:16
Modified: 2026-11-03 16:06
NVD status: Analyzed
Last synced 1 day ago
Verified against the source API 2026-11-03 16:20 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
phpmyadmin / phpmyadmin ≤5.2.3
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Patch / mitigation: https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA
References
- https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA disclosure@vulncheck.com
- https://abraxaslabs.tech/research/phpmyadmin-webauthn disclosure@vulncheck.com
- https://github.com/phpmyadmin/phpmyadmin disclosure@vulncheck.com
- https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/Cus... disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authenti... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-11-03 16:20 UTC · record ↗