Nextcloud Approval App: Auth User File Access Bypass (1.3.0/2.4.9)
CVE-2025-66515 Published on December 5, 2025
Nextcloud Approval app allows users to request approval for other users file
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 users 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.
Vulnerability Analysis
CVE-2025-66515 can be exploited with network access, and requires user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and no impact on availability.
Weakness Type
What is an authentification Vulnerability?
When an actor claims to have a given identity, the software does not prove or insufficiently proves that the claim is correct.
CVE-2025-66515 has been classified to as an authentification vulnerability or weakness.
Affected Versions
nextcloud security-advisories:- Version >= 2.0.0, < 2.5.0 is affected.
- Version < 1.3.1 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.