CVE-2026-119561

medium

phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer::parseAndValidateAssertionResponse() that never verifies WebAuthn asse…

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

6.8

6.8 (CVSS v3.1)

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)

Timeline (UTC)

Published: 2026-10-30 12:16

Modified: 2026-10-30 19:14

NVD status: Awaiting Analysis

Last synced 1 day ago

Verified against the source API 2026-10-30 19:20 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

Not reported by the source (unknown — not "none").

Weakness classification (CWE)

CWE-347

Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.

Mitigation & advisories

No vendor advisory or patch reference tagged by NVD. Check the references below.

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 2026-10-30 19:20 UTC · record ↗

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