CVE-2025-66515

Unknown Unknown - Not Provided

BaseFortify

Publication date: 2025-12-05

Last updated on: 2025-12-09

Assigner: GitHub, Inc.

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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-05

Last Modified

2025-12-09

Generated

2026-07-06

AI Q&A

2025-12-05

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66515

EUVD

EUVD-2025-201457

Affected Vendors & Products

Vendor	Product	Version / Range
nextcloud	approval	From 1.0.0 (inc) to 1.3.1 (exc)
nextcloud	approval	From 2.0.0 (inc) to 2.5.0 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-287	When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Attack-Flow Graph

Executive Summary

This vulnerability in the Nextcloud Approval app allows an authenticated user who is a requester in a workflow to set another user's file into the 'pending approval' state without having access to that file. This is done by using the numeric file ID. The issue exists in versions prior to 1.3.1 and 2.5.0 and has been fixed in those versions.

Impact Analysis

The vulnerability could allow an authenticated user to manipulate the approval status of files they do not have access to, potentially disrupting workflow processes or causing confusion about the approval state of files. However, it does not allow access to the file contents or compromise confidentiality.

Mitigation Strategies

To mitigate this vulnerability, update the Nextcloud Approval app to version 1.3.1 or later, or 2.5.0 or later, as these versions contain the fix for the issue.

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