{"id":"CVE-2026-72836","title":"FileBrowser before 2.63.19 does not account for case-insensitive filesystems when checking home directory ownership during self-registration","summary":"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 files…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-178"],"published":"2026-08-14","updated":"2026-09-08","sourceUpdated":"2026-09-08T20:32:39.347","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72836","references":[{"url":"https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0","label":"disclosure@vulncheck.com"},{"url":"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypass","label":"disclosure@vulncheck.com"},{"url":"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd"],"epss":0.00412,"epssPercentile":0.35091,"ingestedAt":"2026-09-08T21:11:12.278Z","slug":"CVE-2026-72836","body":"## Overview\n\nFileBrowser 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}