Information disclosure in Nextcloud Desktop
CVE-2025-66549
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.
EPSS: 0.003 (17.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 2.4 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N.
Affected products
- Nextcloud Desktop
- Nextcloud Security-advisories — versions < 3.16.5
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Patch, Vendor Advisory)
- security-advisories@github.com (x_refsource_MISC, Issue Tracking)
- security-advisories@github.com (Patch, x_refsource_MISC)
- security-advisories@github.com (Permissions Required, x_refsource_MISC, Vendor Advisory)
Frequently asked questions
- What is CVE-2025-66549?
- CVE-2025-66549 is a low-severity vulnerability in Nextcloud Desktop, classified under Generation of Error Message Containing Sensitive Information. CVSS score: 2.4/10. Published 2025-12-05.
- How severe is CVE-2025-66549?
- Low severity. CVSS v3 base score is 2.4 out of 10.