What’s Vulnerable › Vulnerabilities

CVE-2021-37628: File Drop can be bypassed using Richdocuments app in nextcloud

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% 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-639

Description

Nextcloud Richdocuments is an open source collaborative office suite. In affected versions the File Drop features ("Upload Only" public link shares in Nextcloud) can be bypassed using the Nextcloud Richdocuments app. An attacker was able to read arbitrary files in such a share. It is recommended that the Nextcloud Richdocuments is upgraded to 3.8.4 or 4.2.1. If upgrading is not possible then it is recommended to disable the Richdocuments application.

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/1664
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w
• https://hackerone.com/reports/1253403
• https://github.com/nextcloud/richdocuments/pull/1664
• https://github.com/nextcloud/security-advisories/security/advisories/GHSA-pxhh-954f-8w7w
• https://hackerone.com/reports/1253403

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