CVE-2025-66549

low-risk
Published 2025-12-05

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.

Do I need to act?

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0.04% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
2
CVSS 2.4/10 Low
NETWORK / LOW complexity

Affected Products (1)

Affected Vendors

Nextcloud

References (4)

Patch https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625e...
Issue Tracking https://github.com/nextcloud/desktop/pull/8330
Patch https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-q...
Permissions Required https://hackerone.com/reports/3159877
18
/ 100
low-risk
Severity 13/34 · Low
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal