CVE-2026-67528 OpenProject: Improper Access Control through /api/v3/custom_options/:id via Path "id" leads to Sensitive Data Exposure
Authenticated non-admin users can read sensitive custom field labels by enumerating IDs due to missing visibility checks in the API.
- 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-2026-67528?
CVE-2026-67528 is a medium-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, GET /api/v3/custom_options/:id resolved CustomOption records by global numeric id and allowed UserCustomField and GroupCustomField options without checking visible(current_user), so authenticated non-admin users could enumerate sequential custom option ids and read labels belonging to admin_only user or group custom fields. This issue is fixed in 17.6.0.
Weakness: CWE-863
Which versions are affected by CVE-2026-67528?
How do I fix CVE-2026-67528?
No fix has been published for CVE-2026-67528 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-2026-67528 being exploited?
There is no known exploitation of CVE-2026-67528 in the wild and no public exploit code.
Sources
Also known as GHSA-wr3w-qchj-p4cm.