CVE-2020-28645: ownCloud

Critical severity, CVSS 9.1. EPSS: 1.2% chance of exploitation in the next 30 days.

Deleting users with certain names caused system files to be deleted. Risk is higher for systems which allow users to register themselves and have the data directory in the web root. This affects ownCloud/core versions < 10.6.

Affected products

• ownCloud ownCloud: before 10.6.0 (fixed in 10.6.0)

Published 2021-02-09. Last modified 2026-06-17.