{"id":"UBUNTU-CVE-2026-119561","details":"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.","modified":"2026-11-04T03:30:31.665632516Z","published":"2026-11-03T00:00:00Z","upstream":["CVE-2026-119561"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-119561"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-119561"},{"type":"REPORT","url":"https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA"},{"type":"REPORT","url":"https://abraxaslabs.tech/research/phpmyadmin-webauthn"},{"type":"REPORT","url":"https://github.com/phpmyadmin/phpmyadmin"},{"type":"REPORT","url":"https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.php#L76-L110"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authentication-bypass-via-customserver"}],"affected":[{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:4.0.6-1","4:4.0.8-1","4:4.0.9-1","4:4.0.10-1","4:4.0.10-1ubuntu0.1","4:4.0.10-1ubuntu0.1+esm1","4:4.0.10-1ubuntu0.1+esm2","4:4.0.10-1ubuntu0.1+esm3","4:4.0.10-1ubuntu0.1+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"phpmyadmin","binary_version":"4:4.0.10-1ubuntu0.1+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:4.4.13.1-1","4:4.5.0.2-2","4:4.5.1-1","4:4.5.1-2","4:4.5.1-3","4:4.5.2-1","4:4.5.2-2","4:4.5.3.1-1","4:4.5.4-1","4:4.5.4.1-2","4:4.5.4.1-2ubuntu1","4:4.5.4.1-2ubuntu2","4:4.5.4.1-2ubuntu2.1","4:4.5.4.1-2ubuntu2.1+esm2","4:4.5.4.1-2ubuntu2.1+esm3","4:4.5.4.1-2ubuntu2.1+esm4","4:4.5.4.1-2ubuntu2.1+esm5","4:4.5.4.1-2ubuntu2.1+esm6"],"ecosystem_specific":{"binaries":[{"binary_version":"4:4.5.4.1-2ubuntu2.1+esm6","binary_name":"phpmyadmin"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:4.6.6-5","4:4.6.6-5ubuntu0.2+esm1","4:4.6.6-5ubuntu0.2+esm2","4:4.6.6-5ubuntu0.5","4:4.6.6-5ubuntu0.5+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"4:4.6.6-5ubuntu0.5+esm1","binary_name":"phpmyadmin"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:4.9.1+dfsg1-2","4:4.9.2+dfsg1-1","4:4.9.5+dfsg1-1ubuntu1","4:4.9.5+dfsg1-2","4:4.9.5+dfsg1-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"phpmyadmin","binary_version":"4:4.9.5+dfsg1-2ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.0.4+dfsg2-2ubuntu5","4:5.1.1+dfsg1-5ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"phpmyadmin","binary_version":"4:5.1.1+dfsg1-5ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.1+dfsg-1ubuntu1","4:5.2.1+dfsg-2ubuntu1","4:5.2.1+dfsg-2ubuntu2","4:5.2.1+dfsg-3"],"ecosystem_specific":{"binaries":[{"binary_name":"phpmyadmin","binary_version":"4:5.2.1+dfsg-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/phpmyadmin?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.3+dfsg-1","4:5.2.4~dev~git20260809.e0909b211b+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"phpmyadmin","binary_version":"4:5.2.4~dev~git20260809.e0909b211b+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-119561.json"}},{"package":{"name":"phpmyadmin","ecosystem":"Ubuntu: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