{"id":"CVE-2026-119561","title":"phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer","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 MySQ…","severity":"medium","cvss":6.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","cvssSource":"cna","cwe":["CWE-347"],"vendor":"phpMyAdmin","product":"phpMyAdmin","affected":["phpMyAdmin <= 5.2.3"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-30T16:21:10.400395Z"},"published":"2026-10-30","updated":"2026-10-30","sourceUpdated":"2026-10-30T16:21:29.456Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-119561","references":[{"url":"https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.php#L76-L110"},{"url":"https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA"},{"url":"https://abraxaslabs.tech/research/phpmyadmin-webauthn"},{"url":"https://github.com/phpmyadmin/phpmyadmin"},{"url":"https://www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authentication-bypass-via-customserver","label":"VulnCheck Advisory: phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer"}],"tags":["cve.org"],"epss":0.00204,"epssPercentile":0.10473,"ingestedAt":"2026-11-05T16:24:31.074Z","slug":"CVE-2026-119561","body":"## Overview\n\nphpMyAdmin 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.\n\n## Affected\n\n- `phpMyAdmin <= 5.2.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":37,"depthScoreParts":{"impact":37.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}