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

2.4LOW

Key Information:

Vendor

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

What is CVE-2025-66549?

A vulnerability exists in the Nextcloud Desktop sync client where, until version 3.16.5, manually locking a file within an end-to-end encrypted directory sent the file path to the server unencrypted. This security flaw enabled server administrators to view sensitive file paths in logs, potentially compromising user privacy. The issue has been addressed in version 3.16.5 with an update to prevent unencrypted path transmission.

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Deploy the Patch

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

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