CVE-2021-39224: Nextcloud Officeonline

Medium severity, CVSS 5.3. EPSS: 0.9% chance of exploitation in the next 30 days.

Nextcloud is an open-source, self-hosted productivity platform. The Nextcloud OfficeOnline application prior to version 1.1.1 returned verbatim exception messages to the user. This could result in a full path disclosure on shared files. (e.g. an attacker could see that the file `shared.txt` is located within `/files/$username/Myfolder/Mysubfolder/shared.txt`). It is recommended that the OfficeOnline application is upgraded to 1.1.1. As a workaround, one may disable the OfficeOnline application in the app settings.

Affected products

• Nextcloud Officeonline: before 1.1.1 (fixed in 1.1.1)

Published 2021-10-25. Last modified 2026-06-17.