CVE-2021-32653: Nextcloud Server

Low severity, CVSS 2.7. EPSS: 1.2% chance of exploitation in the next 30 days.

Nextcloud Server is a Nextcloud package that handles data storage. Nextcloud Server versions prior to 19.0.11, 20.0.10, or 21.0.2 send user IDs to the lookup server even if the user has no fields set to published. The vulnerability is patched in versions 19.0.11, 20.0.10, and 21.0.2; no workarounds outside the updates are known to exist.

Affected products

• Nextcloud Nextcloud Server: before 19.0.11 (fixed in 19.0.11); from 20.0.0, before 20.0.10 (fixed in 20.0.10); from 21.0.0, before 21.0.2 (fixed in 21.0.2)

Published 2021-06-01. Last modified 2026-06-17.