CVE-2016-9464: Nextcloud Server

Medium severity, CVSS 4.3. EPSS: 1.6% chance of exploitation in the next 30 days.

Nextcloud Server before 9.0.54 and 10.0.0 suffers from an improper authorization check on removing shares. The Sharing Backend as implemented in Nextcloud does differentiate between shares to users and groups. In case of a received group share, users should be able to unshare the file to themselves but not to the whole group. The previous API implementation simply unshared the file to all users in the group.

Affected products

• Nextcloud Nextcloud Server: before 9.0.54 (fixed in 9.0.54); version 10.0 only

Published 2017-03-28. Last modified 2026-06-17.