CVE-2023-28645

Secure view can be bypassed by using internal API endpoint in Nextcloud richdocuments

CVSS 5.7 MEDIUMEPSS 0.7%CWE-284

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 5.7EPSS 0.7%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

31 Mar 2023Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

Nextcloud richdocuments is a Nextcloud app integrating the office suit Collabora Online. In affected versions the secure view feature of the rich documents app can be bypassed by using unprotected internal API endpoint of the rich documents app. It is recommended that the Nextcloud Office app (richdocuments) is upgraded to 8.0.0-beta.1, 7.0.2 or 6.3.2. Users unable to upgrade may mitigate the issue by taking steps to restrict the ability to download documents. This includes ensuring that the `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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Affected products

nextcloud · security-advisories

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References

https://docs.nextcloud.com/server/latest/admin_manual/office/configuration.html#wopi-settings https://github.com/nextcloud/richdocuments/pull/2604 https://github.com/nextcloud/security-advisories/security/advisories/GHSA-95j6-p5cj-5hh5