CVE-2026-52782: OpenProject: 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
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/projectstorages/<Apsid> via PATCH parameter "storagesprojectstorage[projectfolderid]" 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 projectfolderid 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
OpenProjectto a version that resolves this vulnerability.Fixed in 17.3.3 - Upgrade
Upgrade
OpenProjectto a version that resolves this vulnerability.Fixed in 17.4.1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-52782?
The severity of CVE-2026-52782 is critical with a CVSS score of 9.9.
How do I fix CVE-2026-52782?
To fix CVE-2026-52782, update OpenProject to versions 17.3.3 or 17.4.1 or later.
What type of vulnerability is CVE-2026-52782?
CVE-2026-52782 is an Insecure Direct Object Reference (IDOR) vulnerability.
What attack vector does CVE-2026-52782 utilize?
CVE-2026-52782 utilizes a network attack vector through web parameters.
What resources can be accessed unauthorizedly due to CVE-2026-52782?
CVE-2026-52782 allows project-admins to access unauthorized project storage resources.