Secure view can be bypassed by using internal API endpoint

Description

Impact

The secure view feature of the rich documents app can be bypassed by using unprotected internal API endpoint of the rich documents app.

Patches

It is recommended that the Nextcloud Office app (richdocuments) is upgraded to 8.0.0-beta.1, 7.0.2 or 6.3.2.

Mitigation

To enforce the confidentiality of your files it is crucial to restrict the ability to download the documents.
This includes ensuring that your WOPI configuration is configured to only serve documents between Nextcloud and Collabora. It is highly recommended to define the list of Collabora server IPs as the allow list within the Office admin settings of Nextcloud.

Workarounds

• No workaround available

References

• Hackerone
• PullRequest

For more information

If you have any questions or comments about this advisory:

• Create a post in nextcloud/security-advisories
• Customers: Open a support ticket at support.nextcloud.com