CVE-2023-28645

Name: CVE-2023-28645
Creator: NVD / NIST
Published: 2023-03-31T23:15:07.397+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2023-28645 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.74%

50.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-284

Affected Software

Vendor	Product	Versions
Nextcloud	Richdocuments	>= 6.0.0, < 6.3.2
Nextcloud	Richdocuments	>= 7.0.0, < 7.0.2

References

https://docs.nextcloud.com/server/latest/admin_manual/office/configuration.html#wopi-settingsProduct
https://github.com/nextcloud/richdocuments/pull/2604Patch, Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-95j6-p5cj-5hh5Mitigation, Vendor Advisory
https://docs.nextcloud.com/server/latest/admin_manual/office/configuration.html#wopi-settingsProduct
https://github.com/nextcloud/richdocuments/pull/2604Patch, Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-95j6-p5cj-5hh5Mitigation, Vendor Advisory

Timeline

Published: Mar 31, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-28645?

How severe is CVE-2023-28645?

CVE-2023-28645 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2023-28645?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-28645?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST