CVE-2021-41241: Nextcloud Server

Medium severity, CVSS 4.3. EPSS: 0.9% chance of exploitation in the next 30 days.

Nextcloud server is a self hosted system designed to provide cloud style services. The groupfolders application for Nextcloud allows sharing a folder with a group of people. In addition, it allows setting "advanced permissions" on subfolders, for example, a user could be granted access to the groupfolder but not specific subfolders. Due to a lacking permission check in affected versions, a user could still access these subfolders by copying the groupfolder to another location. It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1. Users unable to upgrade should disable the "groupfolders" application in the admin settings.

Affected products

• Nextcloud Nextcloud Server: before 20.0.14 (fixed in 20.0.14); from 21.0.0, before 21.0.6 (fixed in 21.0.6); version 22.2.0 only

Published 2022-03-08. Last modified 2026-06-17.