CVE-2026-45283 Details
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
A vulnerability exists in the Nextcloud Server Files Lock app, specifically in versions 32.0.0 prior to 32.0.2 and 33.0.0 prior to 33.0.1. The issue arises because the app failed to properly validate file ownership when handling WebDAV lock and unlock requests. As a result, an authenticated user could manipulate files belonging to other users by targeting their absolute WebDAV paths. Furthermore, the vulnerability allowed unauthorized users to access lock tokens through error responses, enabling them to remove token-based locks applied by other users' client applications.
Users are advised to upgrade Nextcloud Server to version 32.0.2 or 33.0.1. Nextcloud Enterprise Server users should upgrade to version 31.0.14.4, 32.0.2, or 33.0.1.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 1, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/nextcloud/files_lock/pull/1007 | [email protected] | Issue TrackingPatch |
| https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4chh-6mhf-p4jj | [email protected] | Vendor Advisory |
| https://hackerone.com/reports/3301553# | [email protected] | Permissions Required |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-287 | Improper Authentication | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| nextcloud nextcloud server | >= 32.0.0, < 32.0.2 >= 33.0.0, < 33.0.1 >= 31.0.0, < 31.0.14.4 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 22, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 3, 2026 | Initial Analysis | [email protected] |
| Jun 1, 2026 | New CVE Received | [email protected] |