Auth bypass in Nextcloud Approval
CVE-2025-66515
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.
Vulnerability class: Broken Authentication
EPSS: 0.003 (24.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.7 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Nextcloud Approval
- Nextcloud Security-advisories — versions >= 2.0.0, < 2.5.0, < 1.3.1
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66515?
- CVE-2025-66515 is a low-severity vulnerability in Nextcloud Approval, classified under Improper Authentication. CVSS score: 2.7/10. Published 2025-12-05.
- How severe is CVE-2025-66515?
- Low severity. CVSS v3 base score is 2.7 out of 10.