{"id":"CVE-2026-119561","aliases":["DEBIAN-CVE-2026-119561","EUVD-2026-113826","GHSA-hmm7-jqq6-vwhr","UBUNTU-CVE-2026-119561"],"status":"published","title":"phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer","description":"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":{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00204,"percentile":0.10488,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-347"],"published":"2026-10-30T11:31:09Z","modified":"2026-11-04T03:30:31Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"phpmyadmin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.1+dfsg-1","4:5.2.1+dfsg-1+deb12u1","4:5.2.1+dfsg-2","4:5.2.1+dfsg-3","4:5.2.1+dfsg-4","4:5.2.2-dev+759fe912a-1","4:5.2.2-really+dfsg-1","4:5.2.2-really+dfsg-2","4:5.2.2-really5.2.2+20241130+dfsg-1","4:5.2.2-really5.2.2+20241228+dfsg-1","4:5.2.2-really5.2.2+20250114+dfsg-1","4:5.2.2-really5.2.2+20250121+dfsg-1","4:5.2.3+dfsg-1","4:5.2.4~dev~git20260809.e0909b211b+dfsg-1"]},{"source":"osv","ecosystem":"Debian:13","package":"phpmyadmin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.2-really+dfsg-1","4:5.2.2-really+dfsg-1+deb13u1","4:5.2.2-really+dfsg-2","4:5.2.3+dfsg-1","4:5.2.4~dev~git20260809.e0909b211b+dfsg-1"]},{"source":"osv","ecosystem":"Debian:14","package":"phpmyadmin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.2-really+dfsg-1","4:5.2.2-really+dfsg-2","4:5.2.3+dfsg-1","4:5.2.4~dev~git20260809.e0909b211b+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:Pro:14.04:LTS","package":"phpmyadmin","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:16.04:LTS","package":"phpmyadmin","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:18.04:LTS","package":"phpmyadmin","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"]},{"source":"osv","ecosystem":"Ubuntu:Pro:20.04:LTS","package":"phpmyadmin","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"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"phpmyadmin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.0.4+dfsg2-2ubuntu5","4:5.1.1+dfsg1-5ubuntu1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"phpmyadmin","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"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"phpmyadmin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.3+dfsg-1","4:5.2.4~dev~git20260809.e0909b211b+dfsg-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"phpmyadmin","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4:5.2.2-really+dfsg-2","4:5.2.3+dfsg-1"]}],"products":[{"vendor":"phpmyadmin","product":"phpmyadmin"}],"references":[{"url":"https://github.com/phpmyadmin/phpmyadmin/blob/RELEASE_5_2_3/libraries/classes/WebAuthn/CustomServer.php#L76-L110","tags":["technical-description","Product","article","report"]},{"url":"https://abraxaslabs.tech/research/PMA-5.2.3-WebAuthn-2FA","tags":["third-party-advisory","Exploit","Mitigation","Third Party Advisory","advisory","report"]},{"url":"https://abraxaslabs.tech/research/phpmyadmin-webauthn","tags":["third-party-advisory","Exploit","Third Party Advisory","advisory","report"]},{"url":"https://github.com/phpmyadmin/phpmyadmin","tags":["product","Product","package","report"]},{"url":"https://www.vulncheck.com/advisories/phpmyadmin-through-5.2.3-webauthn-two-factor-authentication-bypass-via-customserver","tags":["third-party-advisory","Exploit","Third Party Advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-119561","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-hmm7-jqq6-vwhr"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119561.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-119561","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-119561","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-119561","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-119561","title":"phpMyAdmin through 5.2.3 WebAuthn Two-Factor Authentication Bypass via CustomServer","description":"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.","status":"published","published":"2026-10-30T11:31:09.654Z","modified":"2026-10-30T16:21:29.456Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T14:20:10.143031Z"}],"euvd":[{"id":"EUVD-2026-113826","description":"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.","status":"published","published":"2026-10-30T11:31:09Z","modified":"2026-10-30T16:21:29Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:59:05.913237Z"}],"ghsa":[{"id":"GHSA-hmm7-jqq6-vwhr","title":"phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer:...","description":"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.","status":"published","published":"2026-10-30T12:31:21Z","modified":"2026-10-30T12:31:30Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"}],"cwes":["CWE-347"],"updated_at":"2026-11-02T15:14:42.307242Z"}],"nvd":[{"id":"CVE-2026-119561","description":"phpMyAdmin through 5.2.3 contains an authentication bypass vulnerability in CustomServer::parseAndValidateAssertionResponse() that never verifies WebAuthn assertion signatures against stored public keys. 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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.","status":"published","published":"2026-10-30T11:31:09.654Z","modified":"2026-11-05T03:30:36.741382913Z","cvss":[{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-347"],"updated_at":"2026-11-05T07:12:46.161235Z"},{"id":"DEBIAN-CVE-2026-119561","description":"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.","status":"published","published":"2026-10-30T12:16:43.513Z","modified":"2026-11-04T10:01:25.725831118Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"}],"updated_at":"2026-11-04T10:05:32.187009Z"},{"id":"UBUNTU-CVE-2026-119561","description":"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.","status":"published","published":"2026-10-30T12:16:00Z","modified":"2026-11-05T11:47:24.412216805Z","cvss":[{"version":"3.1","score":6.8,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"medium"},{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","level":"high"},{"version":"4.0","score":7.6,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-05T13:30:15.321876Z"}]}}