Authenticated username enumeration via wildcard share search
Published Feb 12, 2026 · Updated Feb 12, 2026
Username enumeration in ownCloud Classic 8.1.8 allows remote authenticated users to discover user accounts through the sharing API. The core/ajax/share.php handler accepts a wildcard search value and returns JSON containing usernames instead of restricting the recipient lookup. A valid low-privilege account and request token are required; the response discloses account names but does not alter accounts or files.
Summary
What happened
Username enumeration in ownCloud Classic 8.1.8 allows remote authenticated users to discover user accounts through the sharing API. The core/ajax/share.php handler accepts a wildcard search value and returns JSON containing usernames instead of restricting the recipient lookup. A valid low-privilege account and request token are required; the response discloses account names but does not alter accounts or files.
The record
- CVE
- CVE-2019-25337
- Published
- Feb 12, 2026
- Updated
- Feb 12, 2026
- Vendor
- ownCloud
- Product
- ownCloud Classic
- Classifications
- CWE-203, T1087
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 12, 2026CVE publishedPublication date reported by the CVE source.
- Feb 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=8.1.8
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- OwnCloud 8.1.8 - Username Disclosureproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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