CVE-2021-37629: Nextcloud Richdocuments

Medium severity, CVSS 5.3. EPSS: 1.4% chance of exploitation in the next 30 days.

Nextcloud Richdocuments is an open source collaborative office suite. In affected versions there is a lack of rate limiting on the Richdocuments OCS endpoint. This may have allowed an attacker to enumerate potentially valid share tokens. It is recommended that the Nextcloud Richdocuments app is upgraded to either 3.8.4 or 4.2.1 to resolve. For users unable to upgrade it is recommended that the Richdocuments application be disabled.

Affected products

• Nextcloud Richdocuments: before 3.8.4 (fixed in 3.8.4); from 4.0.0, before 4.2.1 (fixed in 4.2.1)

Published 2021-09-07. Last modified 2026-06-17.