{"id":"CVE-2026-109206","summary":"LogicalDOC Community Edition through 9.3 Username Enumeration via AvatarServlet","details":"LogicalDOC Community Edition through 9.3 contains a username enumeration vulnerability that allows unauthenticated attackers to identify valid accounts because the AvatarServlet (/avatar) performs no session validation. Attackers can supply usernames or numeric IDs in the userId parameter and compare 1x1 transparent images against real avatars to enumerate users and retrieve profile pictures.","modified":"2026-10-13T02:46:39.204144998Z","published":"2026-10-12T13:39:47.896Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109206.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-204"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/109xxx/CVE-2026-109206.json"},{"type":"PACKAGE","url":"https://github.com/logicaldoc/community"},{"type":"ARTICLE","url":"https://github.com/logicaldoc/community/blob/9.3/logicaldoc-webapp/src/main/java/com/logicaldoc/web/AvatarServlet.java#L63"},{"type":"FIX","url":"https://github.com/logicaldoc/community/commit/4e93a69526ae7fe50f670b85b3fc57181f3de3f7"},{"type":"ARTICLE","url":"https://github.com/logicaldoc/community/discussions/119"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-109206"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/logicaldoc-community-edition-through-9.3-username-enumeration-via-avatarservlet"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/logicaldoc/community","events":[{"introduced":"0"},{"last_affected":"ab9fa93090869e6f3a77f2e9b0704e5381ae56ff"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"0"},{"last_affected":"9.3"}]}}],"versions":["9.3","9.2.3","9.2.2","9.2.1","9.2","before-jakarta-porting","9.1.1","9.1","9.0","8.9.3","8.9.2","8.9.1","8.9","8.8.5","8.8.4","8.8.2","8.7.3","8.6.1","8.5.2","8.4.2","v8.0","8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-109206.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}