Nextcloud Server is a self hosted personal cloud system. A malicious user was able to send delete requests for old versions of files they only got shared with read permissions. It is recommended that the Nextcloud Server is upgraded to 26.0.12 or 27.1.7 or 28.0.3 and that the Nextcloud Enterprise Server is upgraded to 26.0.12 or 27.1.7 or 28.0.3.
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 | 25.0.0 (including) | 25.0.13.7 (excluding) |
| Nextcloud_server | Nextcloud | 26.0.0 (including) | 26.0.13 (excluding) |
| Nextcloud_server | Nextcloud | 27.0.0 (including) | 27.1.8 (excluding) |
| Nextcloud_server | Nextcloud | 28.0.0 (including) | 28.0.4 (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: