CVE-2021-41241: Advanced permissions is not respected for subfolders in Nextcloud server
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 Software
Remediation
Patch Available
Patch Available
Event History
Frequently Asked Questions
What is the severity of CVE-2021-41241?
CVE-2021-41241 has a medium severity rating, affecting the groupfolders application in Nextcloud.
How do I fix CVE-2021-41241?
To fix CVE-2021-41241, you should upgrade to Nextcloud Server version 20.0.14 or 21.0.6 and later.
What versions of Nextcloud are affected by CVE-2021-41241?
CVE-2021-41241 affects Nextcloud Server versions prior to 20.0.14 and versions between 21.0.0 and 21.0.6.
What impact does CVE-2021-41241 have on Nextcloud users?
CVE-2021-41241 can potentially allow unauthorized access to advanced permissions on shared folders within the groupfolders application.
Where can I find more information about CVE-2021-41241?
More information about CVE-2021-41241 can typically be found in security advisories related to Nextcloud.