Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Server and starting in version 20.0.0 and prior to versions 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 of Nextcloud Enterprise Server, a malicious user could update any personal or global external storage, making them inaccessible for everyone else as well. Nextcloud Server 25.0.13, 26.0.8, and 27.1.3 and Nextcloud Enterprise Server is upgraded to 20.0.14.16, 21.0.9.13, 22.2.10.15, 23.0.12.12, 24.0.12.8, 25.0.13, 26.0.8, and 27.1.3 contain a patch for this issue. As a workaround, disable app files_external. This workaround also makes the external storage inaccessible but retains the configurations until a patched version has been deployed.
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 | 20.0.0 (including) | 20.0.14.16 (excluding) |
| Nextcloud_server | Nextcloud | 21.0.0 (including) | 21.0.9.13 (excluding) |
| Nextcloud_server | Nextcloud | 22.0.0 (including) | 22.2.10.15 (excluding) |
| Nextcloud_server | Nextcloud | 23.0.0 (including) | 23.0.12.12 (excluding) |
| Nextcloud_server | Nextcloud | 24.0.0 (including) | 24.0.12.8 (excluding) |
| Nextcloud_server | Nextcloud | 25.0.0 (including) | 25.0.13 (excluding) |
| Nextcloud_server | Nextcloud | 26.0.0 (including) | 26.0.8 (excluding) |
| Nextcloud_server | Nextcloud | 27.0.0 (including) | 27.1.3 (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: