Low severity · published Dec 5, 2025
CVE-2025-66515
The Nextcloud Approval app allows approval or disapproval of files in the sidebar
2.7
CVSS
0.3%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AP
Approval · Nextcloud
1.0.0 before 1.3.1; 2.0.0 before 2.5.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66515
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66515
Patch
https://github.com/nextcloud/approval/commit/e30b56b7832255311ac800b7875f44866e88fff4
Issue Tracking
https://github.com/nextcloud/approval/pull/334
Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-q26g-fmjq-x5g5
Issue Tracking
https://hackerone.com/reports/3338748
More from Approval
6.5
CVE-2026-45275
Nextcloud: Authorization bypass in approval feature allows unauthorized file sharing with approvers
4.3
CVE-2026-82982
The Approval app's approve/reject endpoint is meant to require the file's current etag as a freshness check, preventing an approver from approving or rejecting a file whose…
3.3
CVE-2026-45277
Nextcloud: Information disclosure in Nextcloud Approval app via fileId parameter reveals workflow associations