CVE-2026-72834 filebrowser before 2.63.19 Permission Bypass via checksum
Authenticated users with disabled download permissions can bypass checks to obtain file checksums, enabling content verification and brute-force attacks.
- 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-2026-72834?
CVE-2026-72834 is a medium-severity missing authorization vulnerability in filebrowser, published on 14 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
filebrowser before 2.63.19 contains a permission bypass in the /api/resources endpoint. The checksum (?checksum=) branch of resourceGetHandler reads the entire file to compute a digest and returns it without performing a Perm.Download check (unlike the sibling raw, preview, and subtitle paths). As a result, an authenticated user provisioned with Perm.Download=false can obtain a content-hash oracle for any same-scope file (md5/sha1/sha256/sha512), enabling confirmation of known/guessed content, change detection, and offline brute-force of low-entropy files. This is an incomplete fix of CVE-2026-35606; it bypasses only the Download permission and does not defeat scope/path authorization.
Weakness: CWE-200
Which versions are affected by CVE-2026-72834?
How do I fix CVE-2026-72834?
No fix has been published for CVE-2026-72834 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-2026-72834 being exploited?
There is no known exploitation of CVE-2026-72834 in the wild and no public exploit code.
Sources
Also known as GHSA-7whw-q6gh-xr59, GHSA-vmph-pw37-x65f.