Vulnerability · Published Aug 14, 2026 · Assigned by VulnCheck
CVE-2026-72836FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass
High 8.1
In plain English
A high-severity security flaw in filebrowser from filebrowser. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| filebrowser | filebrowser | 0 – before 2.63.19 |
Weakness: CWE-178 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- GitHub Security Advisory (GHSA-576v-w77m-gr84) vendor-advisory
- Patch Commit patch
- VulnCheck Advisory: FileBrowser before 2.63.19 Case Sensitivity Authentication Bypass third-party-advisory