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TI-2021-12416 Aliases CVE-2021-32748

WOPI API not protected by credentials/IP check

Priority LOW 22CWE-862Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

Nextcloud Richdocuments in an open source self hosted online office. Nextcloud uses the WOPI ("Web Application Open Platform Interface") protocol to communicate with the Collabora Editor, the communication between these two services was not protected by a credentials or IP check. Whilst this does not result in gaining access to data that the user has not yet access to, it can result in a bypass of any enforced watermark on documents as described on the [Nextcloud Virtual Data Room](https://nextcloud.com/virtual-data-room/) website and [our documentation](https://portal.nextcloud.com/article/nextcloud-and-virtual-data-room-configuration-59.html). The Nextcloud Richdocuments releases 3.8.3 and 4.2.0 add an additional admin settings for an allowlist of IP addresses that can access the WOPI API. We recommend upgrading and configuring the allowlist to a list of Collabora servers. There is no known workaround. Note that this primarily results a bypass of any configured watermark or download protection using File Access Control. If you do not require or rely on these as a security feature no immediate action is required on your end.

Why it matters now

EPSS 0.00986 62nd percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 3.8.3, 4.2.0

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisoriesbefore 3.8.3; 4.0.0 to before 4.2.03.8.3, 4.2.0Patch availableCNA
  • security-advisories Vendornextcloud Affected before 3.8.3; 4.0.0 to before 4.2.0 Fixed in 3.8.3, 4.2.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:*before 3.8.3; 4.0.0 to before 4.2.0Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:* Versions before 3.8.3; 4.0.0 to before 4.2.0 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 3.8.3, 4.2.0

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-32748

References

Advisory 2

Other 1

  • TI-2021-15503 File Drop can be bypassed using Richdocuments app in nextcloud CVSS 3.1HIGH 7.5
  • 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
See all 7 →

Sources

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