Nextcloud Server before 9.0.55 and 10.0.2 suffers from a permission increase on re-sharing via OCS API issue. A permission related issue within the OCS sharing API allowed an authenticated adversary to reshare shared files with an increasing permission set. This may allow an attacker to edit files in a share despite having only a read permission set. Note that this only affects folders and files that the adversary has at least read-only permissions for.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nextcloud_server | Nextcloud | * | 9.0.54 (including) |
| Nextcloud_server | Nextcloud | 10.0.2 (including) | 10.0.2 (including) |