---
id: CVE-2025-66549
title: Nextcloud Desktop is the desktop sync client for Nextcloud
summary: >-
  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 ad…
severity: low
cvss: 2.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N'
cwe:
  - CWE-209
vendor: nextcloud
product: desktop
affected:
  - 'desktop >= 3.0.0, < 3.16.5'
patched:
  - desktop 3.16.5
published: '2025-12-05'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:10:00.327'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-66549'
references:
  - url: >-
      https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6
    label: security-advisories@github.com
  - url: 'https://github.com/nextcloud/desktop/pull/8330'
    label: security-advisories@github.com
  - url: >-
      https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hw
    label: security-advisories@github.com
  - url: 'https://hackerone.com/reports/3159877'
    label: security-advisories@github.com
tags:
  - nvd
epss: 0.00297
epssPercentile: 0.22236
ingestedAt: '2026-10-27T18:12:09.279Z'
---

## Overview

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

- `desktop >= 3.0.0, < 3.16.5`

## Remediation

Upgrade past the affected range:

- `desktop 3.16.5`