CVE-2023-28645 json
Secure view can be bypassed by using internal API endpoint in Nextcloud richdocuments
published 2023-03-31 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-32306
- cvss
- 5.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.7%
- EPSS 0.7% chance of exploitation in 30 days, percentile 55%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 20 mo ago
Exploit prediction
0.74% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.7 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
Affected products
- nextcloud security-advisories
Classification
- Weakness
-
- CWE-284 Improper Access Control
References
-
github.com
/nextcloud/richdocuments/pull/2604
patch, vendor-advisory
-
github.com
/nextcloud/security-advisories/security/advisories/GHSA-95j6-p5cj-5hh5
mitigation, vendor-advisory
-
docs.nextcloud.com
/server/latest/admin_manual/office/configuration.html#wopi-settings
product
Sources
- CVE List CVE-2023-28645
- NVD CVE-2023-28645
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