CVE-2025-53827: ownCloud Core

Critical severity, CVSS 9.1. EPSS: 0.6% chance of exploitation in the next 30 days.

ownCloud Core is the server-side component of the file storage, synchronization, and sharing application ownCloud Classic. In versions prior to 10.15.3, the Updater on ownCloud 10 before 10.15.3 has an exposed dangerous method or function. Attackers with administrative privileges may leverage functionality to execute arbitrary code. This issue has been fixed in version 10.15.3.

Affected products

• ownCloud ownCloud Core: before 10.15.3 (fixed in 10.15.3)

Published 2026-07-06. Last modified 2026-10-06.