Low severity · published Dec 5, 2025
CVE-2025-66549
Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end encrypted directory
2.7
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 22% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
security-advisories · nextcloud
< 3.16.5 · source: vendor
DE
Desktop · Nextcloud
3.0.0 before 3.16.5 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66549
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66549
Patch
https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6
Issue Tracking
https://github.com/nextcloud/desktop/pull/8330
Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hw
Permissions Required
https://hackerone.com/reports/3159877
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