Nextcloud Server is a self hosted personal cloud system. After a user received a share with some files inside being blocked by the files access control, the user would still be able to copy the intermediate folder inside Nextcloud allowing them to afterwards potentially access the blocked files depending on the user access control rules. It is recommended that the Nextcloud Server is upgraded to 27.1.9, 28.0.5 or 29.0.0 and Nextcloud Enterprise Server is upgraded to 21.0.9.18, 22.2.10.23, 23.0.12.18, 24.0.12.14, 25.0.13.9, 26.0.13.3, 27.1.9, 28.0.5 or 29.0.0.
The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nextcloud_server | Nextcloud | 21.0.0 (including) | 21.0.9.18 (excluding) |
| Nextcloud_server | Nextcloud | 22.0.0 (including) | 22.2.10.23 (excluding) |
| Nextcloud_server | Nextcloud | 23.0.0 (including) | 23.0.12.18 (excluding) |
| Nextcloud_server | Nextcloud | 24.0.0 (including) | 24.0.12.14 (excluding) |
| Nextcloud_server | Nextcloud | 25.0.0 (including) | 25.0.13.9 (excluding) |
| Nextcloud_server | Nextcloud | 26.0.0 (including) | 26.0.13.3 (excluding) |
| Nextcloud_server | Nextcloud | 27.0.0 (including) | 27.1.9 (excluding) |
| Nextcloud_server | Nextcloud | 28.0.0 (including) | 28.0.5 (excluding) |
Access control involves the use of several protection mechanisms such as:
When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses: