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.

CVSS 3.1

2.7CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

EPSS

0.3% chance of exploitation in the next 30 days; higher than 22% of CVEs (scores of 2026-10-25)

CWE

CWE-209

Published

2025-12-05

Modified

2026-10-15

Record from

the NVD, synced 2026-10-19

Affected

• nextcloud:desktop

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

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