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TI-2021-15503 Aliases CVE-2021-37628

File Drop can be bypassed using Richdocuments app in nextcloud

Priority LOW 37CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

EPSS 0.0209 81st percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 3.8.4, 4.2.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisoriesbefore 3.8.4; 4.0.0 to before 4.2.13.8.4, 4.2.1Patch availableCNA
  • security-advisories Vendornextcloud Affected before 3.8.4; 4.0.0 to before 4.2.1 Fixed in 3.8.4, 4.2.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:*before 3.8.4; 4.0.0 to before 4.2.1Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:* Versions before 3.8.4; 4.0.0 to before 4.2.1 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 3.8.4, 4.2.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-37628

References

Patch 1

Advisory 2

  • TI-2023-13163 Secure view can be bypassed by using internal API endpoint in Nextcloud richdocuments CVSS 3.1MEDIUM 6.5
  • TI-2022-13069 Federated editing allows iframing remote servers by default in richdocuments CVSS 3.1MEDIUM 6.5
  • TI-2023-10612 Document content of files can be obtained through Collabora for files of other users CVSS 3.1MEDIUM 5.8
  • TI-2021-15504 Lack of ratelimit on Richdocuments OCS endpoint in nextcloud CVSS 3.1MEDIUM 5.3
  • TI-2021-16608 File path disclosure of shared files in Richdocuments application CVSS 3.1MEDIUM 5.3
  • TI-2023-10621 Nextcloud Server previews are accessible without a watermark CVSS 3.1MEDIUM 5.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences