CVE-2025-66549: Nextcloud Desktop

Low severity, CVSS 2.7. EPSS: 0.3% chance of exploitation in the next 30 days.

Nextcloud Desktop is the desktop sync client for Nextcloud. Prior to 3.16.5, when trying to manually lock a file inside an end-to-end encrypted directory, the path of the file was sent to the server unencrypted, making it possible for administrators to see it in log files. This vulnerability is fixed in 3.16.5.

Affected products

• Nextcloud Desktop: from 3.0.0, before 3.16.5 (fixed in 3.16.5)

Published 2025-12-05. Last modified 2026-06-17.