File-path disclosure via unmangled WebDAV lock request
Published Dec 5, 2025 · Updated Dec 8, 2025
Information disclosure in Nextcloud Desktop before 3.16.5 allows remote authenticated users to read cleartext file paths from server logs. LockFileJob::start() built its WebDAV LOCK request with path() instead of the journal record's end-to-end-encrypted mangled name. A client user must manually lock a file inside an end-to-end encrypted directory; a server administrator can then recover its cleartext path from logs.
Summary
What happened
Information disclosure in Nextcloud Desktop before 3.16.5 allows remote authenticated users to read cleartext file paths from server logs. LockFileJob::start() built its WebDAV LOCK request with path() instead of the journal record's end-to-end-encrypted mangled name. A client user must manually lock a file inside an end-to-end encrypted directory; a server administrator can then recover its cleartext path from logs.
The record
- CVE
- CVE-2025-66549
- Published
- Dec 5, 2025
- Updated
- Dec 8, 2025
- Vendor
- Nextcloud GmbH
- Product
- Security Advisories
- Classifications
- CWE-209
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Dec 5, 2025CVE publishedPublication date reported by the CVE source.
- Dec 8, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 3.16.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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