CVE-2025-66515 Nextcloud Approval app allows users to request approval for other users file

Low 2.7 Published 5 Dec 2025 Updated 5 Dec 2025

Authenticated users can modify approval status of other users' files without proper authorization, requiring an upgrade to the Nextcloud Approval app.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-66515?

CVE-2025-66515 is a low-severity missing authorization vulnerability in nextcloud security-advisories, published on 5 Dec 2025. An attacker needs administrator access to exploit it, with no action from the victim.

Official description

The Nextcloud Approval app allows approval or disapproval of files in the sidebar. Prior to 1.3.1 and 2.5.0, an authenticated user listed as a requester in a workflow can set another user’s file into the “pending approval” without access to the file by using the numeric file id. This vulnerability is fixed in 1.3.1 and 2.5.0.

Weakness: CWE-287

Which versions are affected by CVE-2025-66515?

It affects 1 product.

Products include Nextcloud Approval.

How do I fix CVE-2025-66515?

No fix has been published for CVE-2025-66515 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-2025-66515 being exploited?

There is no known exploitation of CVE-2025-66515 in the wild and no public exploit code.

Sources

Also known as GHSA-q26g-fmjq-x5g5.