How severe is CVE-2023-28645?

CVE-2023-28645 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2023-28645 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-28645?

CVE-2023-28645 affects Nextcloud Richdocuments. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-28645?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-28645 published?

CVE-2023-28645 was published on 2023-03-31 and last updated on 2026-06-17.

CVE-2023-28645

CVE-2023-28645 is a medium-severity vulnerability in Nextcloud Richdocuments with a CVSS 3.x base score of 5.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: Medium (CVSS 3.x base score 5.7)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Nextcloud Richdocuments
Published: 2023-03-31
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-28645?: 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.
How severe is CVE-2023-28645?: CVE-2023-28645 has a CVSS 3.x base score of 5.7, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2023-28645 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-28645?: CVE-2023-28645 affects Nextcloud Richdocuments. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-28645?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-28645 published?: CVE-2023-28645 was published on 2023-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:*

More vulnerabilities in Nextcloud Richdocuments

CVE-2021-37628 — High (CVSS 7.5): Nextcloud Richdocuments is an open source collaborative office suite. In affected versions the File Drop features…
CVE-2022-31024 — Medium (CVSS 6.5): richdocuments is the repository for NextCloud Collabra, the app for Nextcloud Office collaboration. Prior to versions…
CVE-2023-25150 — Medium (CVSS 5.8): Nextcloud office/richdocuments is an office suit for the nextcloud server platform. In affected versions the Collabora…
CVE-2021-37629 — Medium (CVSS 5.3): Nextcloud Richdocuments is an open source collaborative office suite. In affected versions there is a lack of rate…
CVE-2021-39223 — Medium (CVSS 4.8): Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud Richdocuments application prior to…
CVE-2021-32748 — Medium (CVSS 4.3): Nextcloud Richdocuments in an open source self hosted online office. Nextcloud uses the WOPI ("Web Application Open…

All CVEs affecting Nextcloud Richdocuments →

Other CWE-284 (Improper Access Control) vulnerabilities

CVE-2026-50746 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Access Control vulnerability found in UniFi…
CVE-2026-46978 — Critical (CVSS 10.0): Vulnerability in the Oracle Solaris product of Oracle Systems (component: Remote Administration Daemon). The…
CVE-2026-35308 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Centralized Third Party Jars).…
CVE-2026-35307 — Critical (CVSS 10.0): Vulnerability in the Oracle Coherence product of Oracle Fusion Middleware (component: Core). Supported versions that…
CVE-2026-46695 — Critical (CVSS 10.0): Boxlite is a sandbox service that allows users to create lightweight virtual machines (Boxes) and launch OCI containers…
CVE-2026-46840 — Critical (CVSS 10.0): Vulnerability in Oracle REST Data Services (component: Backend-as-a-Service). Supported versions that are affected are…

Browse all CWE-284 (Improper Access Control) vulnerabilities →