CVE-2026-45283
MEDIUM EPSS 11.4%
Published Jun 1, 20264w ago · Modified Jun 17, 20261w ago
4.3 CVSS 3.1
Published Jun 1, 2026 4w ago
Last Modified Jun 17, 2026 1w ago
Description
Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.2, and 33.0.0 to before 33.0.1, the files_lock app did not properly validate the ownership of files when processing DAV lock and unlock requests. An authenticated user could lock or unlock files belonging to other users by targeting their absolute WebDAV paths. Additionally, lock tokens were disclosed to unauthorized callers in error responses, allowing attackers to remove token-based locks placed by other users' client applications. It is recommended that the Nextcloud Server is upgraded to 32.0.2 or 33.0.1. It is recommended that the Nextcloud Enterprise Server is upgraded to 31.0.14.4 or 32.0.2 or 33.0.1
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None
Threat Intelligence
EPSS Exploit Probability
11.4% percentile
Exploit & Patch Status
No Known Exploit
Patch Available
Weaknesses 1
CWE-287 Improper Authentication Authentication
Affected Products 5
References 3
- github.com https://github.com/nextcloud/files_lock/pull/1007
- github.com https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4chh-6mhf-p4jj
- hackerone.com https://hackerone.com/reports/3301553#
Remediation
- github.com https://github.com/nextcloud/files_lock/pull/1007