{"id":"CVE-2026-72836","summary":"FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass","details":"FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration. When Signup and CreateUserDir are enabled and FileBrowser's root is on a case-insensitive filesystem (confirmed on Windows/NTFS), two self-registered usernames that differ only in letter case (e.g., CaseVictim and casevictim) are stored as distinct accounts but resolve to the same physical home directory, because the scope-ownership check compares the persisted scope as an exact case-sensitive string. A second registrant can therefore read, overwrite, and delete another account's files through authenticated HTTP endpoints, without needing an existing account or victim interaction.","aliases":["GHSA-576v-w77m-gr84"],"modified":"2026-08-19T03:31:15.812286759Z","published":"2026-08-14T11:35:41.491Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-178"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72836.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72836.json"},{"type":"ADVISORY","url":"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72836"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypass"},{"type":"FIX","url":"https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/filebrowser/filebrowser","events":[{"introduced":"0"},{"fixed":"328f629181888760f3c8b3ff9f3b5bec50f4e54f"},{"fixed":"fe7efb2e6afe66774cd86a5b0a03033bd514d0c0"}],"database_specific":{"source":["DESCRIPTION","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.63.19"}]}}],"versions":["v2.63.18","v2.63.17","v2.63.16","v2.63.15","v2.63.14","v2.63.13","v2.63.12","v2.63.11","v2.63.10","v2.63.9","v2.63.8","v2.63.7","v2.63.6","v2.63.5","v2.63.4","v2.63.3","v2.63.1","v2.63.0","v2.62.2","v2.62.1","v2.62.0","v2.61.2","v2.61.1","v2.61.0","v2.60.0","v2.59.0","v2.58.0","v2.57.1","v2.57.0","v2.56.0","v2.55.0","v2.54.0","v2.53.1","v2.53.0","v2.52.0","v2.51.2","v2.51.1","v2.51.0","v2.50.0","v2.49.0","v2.48.2","v2.48.1","v2.48.0","v2.47.0","v2.46.1","v2.46.0","v2.45.3","v2.45.2","v2.45.1","v2.45.0","v2.44.2","v2.44.1","v2.44.0","v2.43.0","v2.42.5","v2.42.4","v2.42.3","v2.42.2","v2.42.1","v2.42.0","v2.41.0","v2.40.2","v2.40.1","v2.40.0","v2.39.0","v2.38.0","v2.37.0","v2.36.3","v2.36.2","v2.36.1","v2.36.0","v2.35.0","v2.34.2","v2.34.1","v2.34.0","v2.33.10","v2.33.9","v2.33.8","v2.33.7","v2.33.6","v2.33.5","v2.33.4","v2.33.3","v2.33.2","v2.33.1","v2.33.0","v2.32.3","v2.32.2","v2.32.1","v2.32.0","v2.31.2","v2.31.1","v2.31.0","v2.30.0","v2.29.0","v2.28.0","v2.27.0","v2.26.0","v2.25.0","v2.24.2","v2.24.1","v2.24.0","v2.23.0","v2.22.4","v2.22.3","v2.22.2","v2.22.1","v2.22.0","v2.21.1","v2.21.0","v2.20.1","v2.20.0","v2.19.0","v2.18.0","v2.17.2","v2.17.1","v2.17.0","v2.16.1","v2.16.0","v2.15.0","v2.14.1","v2.14.0","v2.13.0","v2.12.1","v2.12.0","v2.11.0","v2.10.0","v2.9.0","v2.8.0","v2.7.0","v2.6.2","v2.6.1","v2.6.0","v2.5.0","v2.4.0","v2.3.0","v2.2.0","v2.1.2","v2.1.1","v2.1.0","v2.0.16","v2.0.15","v2.0.14","v2.0.13","v2.0.12","v2.0.11","v2.0.10","v2.0.9","v2.0.8","v2.0.7","v2.0.6","v2.0.5","v2.0.4","v2.0.3","v2.0.2","v2.0.1","v2.0.0","v2.0.0-rc.2","v2.0.0-rc.1","v1.11.0","v1.10.0","v1.9.0","v1.8.0","v1.7.1","v1.7.0","v1.6.0","v1.5.5","v1.5.4","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.0","v1.3.12","v1.3.11","v1.3.10","v1.3.9","v1.3.8","v1.3.7","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.9","v1.2.8","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.1","v1.1.0","v1.0.2","v1.0.1","v1.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72836.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}