CVE-2026-52782

Description

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through /projects/<A>/settings/project_storages/<A_ps_id> via PATCH parameter -storages_project_storage[project_folder_id]- leads to Access to Unauthorized Resources. A project-admin in one project can hijack the managed Nextcloud or OneDrive folder of another project on the same storage by writing the victim project-s project_folder_id into the attacker-s Storages::ProjectStorage row. The next managed-folder sync overwrites the ACL on the referenced folder with the attacker project-s user list. This vulnerability is fixed in 17.3.3 and 17.4.1.