CVE-2026-33330 FileRise ONLYOFFICE integration allows read-only users to overwrite files via forged save callback

High 7.1 Published 24 Mar 2026 Updated 24 Mar 2026

Authenticated read-only users can overwrite files by forging ONLYOFFICE save callbacks, allowing unauthorized data modification.

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-2026-33330?

CVE-2026-33330 is a high-severity missing authorization vulnerability in error311 FileRise, published on 24 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

FileRise is a self-hosted web file manager / WebDAV server. Prior to version 3.10.0, a broken access control issue in FileRise's ONLYOFFICE integration allows an authenticated user with read-only access to obtain a signed save callbackUrl for a file and then directly forge the ONLYOFFICE save callback to overwrite that file with attacker-controlled content. This issue has been patched in version 3.10.0.

Weakness: CWE-863

Which versions are affected by CVE-2026-33330?

It affects 1 product.

Products include Filerise Filerise.

How do I fix CVE-2026-33330?

No fix has been published for CVE-2026-33330 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-2026-33330 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33330 exists.

Sources

Also known as GHSA-6c3j-f4x4-36m3.