{"id":"CVE-2026-103021","title":"OpenEMR: Username Enumeration via Pre-Authentication User Settings Loading","summary":"OpenEMR is a free and open source electronic health records and medical practice management application. From 6.0.0 until 8.3.0, interface/globals.php uses the unauthenticated authUser login parameter to populate temp_authuserid and load…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"cna","cwe":["CWE-200","CWE-203","CWE-208"],"vendor":"openemr","product":"openemr","affected":["openemr >= 6.0.0, < 8.3.0"],"published":"2026-11-05","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:06:36.954Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-103021","references":[{"url":"https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff","label":"https://github.com/openemr/openemr/security/advisories/GHSA-rr38-hpxq-wwff"},{"url":"https://github.com/openemr/openemr/pull/13133","label":"https://github.com/openemr/openemr/pull/13133"},{"url":"https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5","label":"https://github.com/openemr/openemr/commit/50f789fad45ada625fe8d0faf0c7a9c15ef52aa5"},{"url":"https://github.com/openemr/openemr/releases/tag/v8_3_0","label":"https://github.com/openemr/openemr/releases/tag/v8_3_0"}],"tags":["cve.org"],"ingestedAt":"2026-11-05T22:38:31.696Z","slug":"CVE-2026-103021","body":"## Overview\n\nOpenEMR is a free and open source electronic health records and medical practice management application. From 6.0.0 until 8.3.0, interface/globals.php uses the unauthenticated authUser login parameter to populate temp_authuserid and load that account's user_settings before authentication succeeds. Existing usernames can therefore cause an additional database query and may apply visible customized settings, while nonexistent usernames skip that behavior. A remote unauthenticated actor can use timing or page differences to enumerate valid accounts for later credential attacks. This issue is fixed in version 8.3.0.\n\n## Affected\n\n- `openemr >= 6.0.0, < 8.3.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}