CVE-2026-67527 OpenProject: Improper Access Control through /api/v3/work_packages/<X.id> via PATCH parameter "fileLinks"
Authenticated users can bypass file link management permissions to detach, delete, or re-parent file links, exposing metadata and modifying project data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67527?
CVE-2026-67527 is a high-severity missing authorization vulnerability in opf openproject, published on 30 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
OpenProject is open-source, web-based project management software. Prior to 17.6.0, PATCH /api/v3/work_packages/{id} accepted _links.fileLinks and allowed authenticated users with edit_work_packages but without manage_file_links to resolve Storages::FileLink records by raw id, detach or hard-delete existing FileLinks, and re-parent FileLinks from other projects to an attacker-controlled work package, exposing origin filename, origin id, and MIME type metadata. This issue is fixed in 17.6.0.
Weakness: CWE-862
Which versions are affected by CVE-2026-67527?
How do I fix CVE-2026-67527?
No fix has been published for CVE-2026-67527 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-67527 being exploited?
There is no known exploitation of CVE-2026-67527 in the wild and no public exploit code.
Sources
Also known as GHSA-c6rc-4288-8p4f.