Vulnerability Report

CVE-2025-66515

Title: Nextcloud Approval App Unauthorized Workflow Action

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2025-66515.

CWE Category CWE-287
Published Date Dec 05, 2025
Modified Date Oct 15, 2026
Exploit Status Not Found
Score 2.7 CVSS v3.1
Exploit Probability (EPSS)
0.31%

Vulnerability Summary

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.

Impacted Vendors

N
nextcloud 1

Reference Links

https://github.com/nextcloud/approval/commit/e30b56b7832255311ac800b7875f44866e88fff4 https://github.com/nextcloud/approval/pull/334 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-q26g-fmjq-x5g5 https://hackerone.com/reports/3338748
CVSS v3.1
Source Entity [email protected]
Severity LOW
2.7
Attack Vector
NETWORK
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2025-66515 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data or affected products updated.

MODIFIED

Vulnerability data updated via NVD.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N

Affected Stack

No specific products linked.