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CVE-2025-66549

2.4 · LOW

Nextcloud Desktop is the desktop sync client for Nextcloud.

Published Dec 5, 2025CWE-209EPSS 0.30%

Overview

CVE-2025-66549 is a low-severity vulnerability. It was published on December 5, 2025 and has a CVSS 3.1 base score of 2.4 (LOW).

This vulnerability has a CVSS 3.1 base score of 2.4, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6GitHubgithub.com/nextcloud/desktop/pull/8330GitHubgithub.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hwRefhackerone.com/reports/3159877

How CyberStrike helps

Frequently asked questions

What is CVE-2025-66549?

CVE-2025-66549 is a low-severity vulnerability. It was published on December 5, 2025 and has a CVSS 3.1 base score of 2.4 (LOW).

How severe is CVE-2025-66549?

This vulnerability has a CVSS 3.1 base score of 2.4, rated LOW. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2025-66549?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-66549?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-66549 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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