What’s Vulnerable › Vulnerabilities

CVE-2021-37629: Lack of ratelimit on Richdocuments OCS endpoint in nextcloud

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-07 · updated 2026-06-17
• Weakness: CWE-200

Description

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; from 4.0.0 before 4.2.1 — fixed in 3.8.4, 4.2.1

How to fix

Upgrade to a fixed version: nextcloud Richdocuments 3.8.4, 4.2.1. Check the vendor advisory for mitigations.

References

• https://github.com/nextcloud/richdocuments/pull/1663
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gvvr-h36p-8mjx
• https://hackerone.com/reports/1258750
• https://github.com/nextcloud/richdocuments/pull/1663
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-gvvr-h36p-8mjx
• https://hackerone.com/reports/1258750

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