CVE-2025-66549
Publication date 5 December 2025
Last updated 10 December 2025
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| nextcloud-desktop | 25.10 questing |
Not affected
|
| 25.04 plucky |
Needs evaluation
|
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
2.4 · Low
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | High |
| User interaction | Required |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N |
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2025-66549
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hw
- https://github.com/nextcloud/desktop/pull/8330
- https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6
- https://hackerone.com/reports/3159877