CVE-2025-66549

Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end encrypted directory

CVSS 2.4 LOWEPSS 0.2%CWE-209

Vexday Risk Score

8Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 2.4EPSS 0.2%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

05 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

Affected products

nextcloud · security-advisories

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References

https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6 https://github.com/nextcloud/desktop/pull/8330 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hw https://hackerone.com/reports/3159877