Vulnerability · Published Jun 1, 2026 · Assigned by GitHub_M
CVE-2026-45283Nextcloud: Files Lock app allows users to lock and unlock files of other users
Medium 6.3
In plain English
A medium-severity improper authentication in security-advisories from nextcloud. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 11% of all known vulnerabilities).
Official 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
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| nextcloud | security-advisories | >= 32.0.0, < 32.0.2>= 33.0.0, < 33.0.1 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4chh-6mhf-p4jj x_refsource_CONFIRM
- https://github.com/nextcloud/files_lock/pull/1007 x_refsource_MISC
- https://hackerone.com/reports/3301553# x_refsource_MISC