Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end encrypted directory
CVE-2025-66549

2.4LOW

Key Information:

Vendor

Nextcloud
Status
Security-advisories
Vendor
CVE Published:
5 December 2025

What is 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.

Affected Version(s)

security-advisories < 3.16.5

References

https://github.com/nextcloud/security-advisories/security...
x_refsource_CONFIRM
https://github.com/nextcloud/desktop/pull/8330
x_refsource_MISC
https://github.com/nextcloud/desktop/commit/36d6c234d42b0...
x_refsource_MISC

CVSS V3.1

Score:
2.4
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-66549 : File Path Exposure in Nextcloud Desktop Sync Client