Nextcloud Desktop 3.16.5: Unencrypted File Path Leak in E2E Locked Files
CVE-2025-66549 Published on December 5, 2025
Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end encrypted directory
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.
Vulnerability Analysis
CVE-2025-66549 can be exploited with network access, requires user interaction and user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality, a small impact on integrity and availability.
Weakness Type
Generation of Error Message Containing Sensitive Information
The software generates an error message that includes sensitive information about its environment, users, or associated data.
Products Associated with CVE-2025-66549
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Affected Versions
nextcloud security-advisories Version < 3.16.5 is affected by CVE-2025-66549Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.