{"id":"CVE-2026-72836","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72836","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…","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.","published":"2026-08-14T12:16:47.060","modified":"2026-08-14T12:16:47.060","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0","label":"filebrowser/filebrowser@fe7efb2"},"references":[{"type":"WEB","url":"https://github.com/filebrowser/filebrowser/commit/fe7efb2e6afe66774cd86a5b0a03033bd514d0c0"},{"type":"WEB","url":"https://github.com/filebrowser/filebrowser/security/advisories/GHSA-576v-w77m-gr84"},{"type":"WEB","url":"https://www.vulncheck.com/advisories/filebrowser-before-case-sensitivity-authentication-bypass"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-14T12:16:47.060"}}