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CVE-2025-66549

Good to know:

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Date: December 5, 2025

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.

Severity Score

Related Resources (6)

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hw
https://nvd.nist.gov/vuln/detail/CVE-2025-66549
https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6
https://github.com/nextcloud/desktop/pull/8330
https://hackerone.com/reports/3159877
https://www.mend.io/vulnerability-database/CVE-2025-66549

Severity Score

Weakness Type (CWE)

Generation of Error Message Containing Sensitive Information

CWE-209

Top Fix

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Upgrade Version

Upgrade to version https://github.com/nextcloud/desktop.git - v3.16.5

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): NONE
Availability (A): NONE

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