CVE-2025-66549

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

LOW
2.7
CVSS Score
Published: December 5, 2025 at 05:47 PM UTC
Updated: October 15, 2026 at 09:10 PM UTC
2 products affected across 1 vendorDesktopsecurity-advisories

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Severity
LOW2.7
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Desktop· Nextcloudnextcloud-app
95%
3.0.0 ≤ v < 3.16.5

References (4)

x_refsource_MISCIssue Tracking
Source: cverecord
https://github.com/nextcloud/desktop/pull/8330
x_refsource_MISCPermissions RequiredVendor Advisory
Source: cverecord
https://hackerone.com/reports/3159877

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-209

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