CVE-2025-66549

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 v3.1 Score

2.4

LOW

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-209 CWE-209

Affected Products

Vendor	Product	Versions
nextcloud	desktop	3.0.0 — 3.16.5

References

Advisories & Patches

https://github.com/nextcloud/desktop/commit/36d6c234d42b06a6f2e9de3e413a5c3c625edad6 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-h9xj-qh76-q3hw https://hackerone.com/reports/3159877

Other References

https://github.com/nextcloud/desktop/pull/8330

Frequently Asked Questions

What is CVE-2025-66549? +

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. It has a CVSS v3.1 base score of 2.4 (LOW).

How severe is CVE-2025-66549? +

CVE-2025-66549 has a CVSS v3.1 score of 2.4 out of 10, rated LOW. This is a low-severity vulnerability with limited impact.

What products are affected by CVE-2025-66549? +

CVE-2025-66549 affects products from nextcloud, specifically: desktop. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-66549? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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