CVE-2025-665492.4LowCWE-209

CVE-2025-66549: Nextcloud Desktop discloses information when attempting to lock a file inside a end-to-end encrypted directory

nextcloud · security-advisories

Affected: nextcloud security-advisories · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.3%probability of exploitation in the next 30 days

25th percentile

050100

Higher than 25% of scored CVEs

2.4LowCVSS 3.1

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

nextcloud · security-advisories< 3.16.5

On the Atlas

Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.

Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Generation of Error Message Containing Sensitive Information · Information Disclosure
Vendor: nextcloud
Published: December 2025
Band: Unlikely (under 1%), December 2025
Bounty reports: 1 disclosed on HackerOne

Disclosed bug bounty reports about CVE-2025-66549

The reports on HackerOne that name this CVE, with HackerOne's own outcome. Titles and metadata only.

Information disclosure via Desktop client when attempting to lock a file inside a end-to-end encrypted directoryNextcloud · 2026 · none severityValid

CoverageNo articles yet

No CyberSIXT article names CVE-2025-66549 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.