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TI-2023-13163 Aliases CVE-2023-28645

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

Priority LOW 30CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-284.

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00745 55th percentileScored 2026-11-07
Fix Fixed security-advisories (nextcloud): 7.0.2, 6.3.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
nextcloudsecurity-advisories7.0.0 to before 7.0.2; before 6.3.27.0.2, 6.3.2Patch availableCNA
  • security-advisories Vendornextcloud Affected 7.0.0 to before 7.0.2; before 6.3.2 Fixed in 7.0.2, 6.3.2 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:*6.0.0 to before 6.3.2; 7.0.0 to before 7.0.2Vulnerablenextcloud
  • cpe:2.3:a:nextcloud:richdocuments:*:*:*:*:*:*:*:* Versions 6.0.0 to before 6.3.2; 7.0.0 to before 7.0.2 Vulnerable ·nextcloud

Remediation

  • Fix · CNA security-advisories (nextcloud) Fixed in 7.0.2, 6.3.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-28645

References

Patch 1

Advisory 1

Other 1

  • TI-2021-15503 File Drop can be bypassed using Richdocuments app in nextcloud CVSS 3.1HIGH 7.5
  • TI-2022-13069 Federated editing allows iframing remote servers by default in richdocuments CVSS 3.1MEDIUM 6.5
  • TI-2023-10612 Document content of files can be obtained through Collabora for files of other users CVSS 3.1MEDIUM 5.8
  • TI-2021-15504 Lack of ratelimit on Richdocuments OCS endpoint in nextcloud CVSS 3.1MEDIUM 5.3
  • TI-2021-16608 File path disclosure of shared files in Richdocuments application CVSS 3.1MEDIUM 5.3
  • TI-2023-10621 Nextcloud Server previews are accessible without a watermark CVSS 3.1MEDIUM 5.3
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences