CVE-2019-25337: ownCloud

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

OwnCloud 8.1.8 contains a username enumeration vulnerability that allows remote attackers to discover user accounts by manipulating the share.php endpoint. Attackers can send crafted GET requests to /index.php/core/ajax/share.php with a wildcard search parameter to retrieve comprehensive user information.

Affected products

• ownCloud ownCloud: version 8.1.8 only

Published 2026-02-12. Last modified 2026-06-17.