CVE-2026-90929 File Browser 2.5.0 Directory Deletion via Upload Failure Cleanup
Authenticated users with Create and Modify permissions can delete unauthorized directories via a flawed upload cleanup mechanism in File Browser.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-90929?
CVE-2026-90929 is a high-severity missing authorization vulnerability in filebrowser, published on 14 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
File Browser versions >= 2.5.0 and <= 2.63.23 contain an incorrect authorization flaw in the direct-upload endpoint (resourcePostHandler in http/resource.go). Unlike the TUS upload handler, the direct-upload handler does not reject a target that is an existing directory; a POST with ?override=true aimed at a directory fails inside writeFile (a directory cannot be opened for writing) and the failure-cleanup path then calls Fs.RemoveAll on the request path, recursively deleting the entire tree. This cleanup is gated by neither the Perm.Delete permission nor the checkDescendants rule walk applied by the delete and patch handlers, so an authenticated non-administrator holding only the default Create and Modify permissions can delete directories they are not authorized to delete, including rule-denied files within them. Deletion remains confined to the user's scope because ScopedFs.RemoveAll still enforces the scope guard. The faulty cleanup was introduced in v2.5.0; no patched version is available.
Weakness: CWE-863
Which versions are affected by CVE-2026-90929?
How do I fix CVE-2026-90929?
No fix has been published for CVE-2026-90929 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-90929 being exploited?
There is no known exploitation of CVE-2026-90929 in the wild and no public exploit code.
Sources
Also known as GHSA-78rx-w3p8-c3v7, GHSA-c4fr-5f24-4wrj.