Impact
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, a user could still access these subfolders by copying the groupfolder to another location.
Patches
It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1.
Workarounds
Disable the "groupfolders" application in the admin settings.
References
For more information
If you have any questions or comments about this advisory:
Impact
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, a user could still access these subfolders by copying the groupfolder to another location.
Patches
It is recommended that the Nextcloud Server is upgraded to 20.0.14, 21.0.6 or 22.2.1.
Workarounds
Disable the "groupfolders" application in the admin settings.
References
For more information
If you have any questions or comments about this advisory: