CVE-2026-23721: OpenProject users with "View Members" permission in any project can view all Group memberships
OpenProject is an open-source, web-based project management software. When using groups in OpenProject to manage users, the group members should only be visible to users that have the View Members permission in any project that the group is also a member of. Prior to versions 17.0.1 and 16.6.5, due to a failed permission check, if a user had the View Members permission in any project, they could enumerate all Groups and view which other users are part of the group. The issue has been fixed in OpenProject 17.0.1 and 16.6.5. No known workarounds are available.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-23721?
CVE-2026-23721 has a moderate severity level due to the exposure of group memberships to unauthorized users.
How do I fix CVE-2026-23721?
To fix CVE-2026-23721, update OpenProject to version 16.6.5 or 17.0.0 or later.
Who is affected by CVE-2026-23721?
CVE-2026-23721 affects OpenProject installations where users with 'View Members' permissions can see all group memberships.
What type of vulnerability is CVE-2026-23721?
CVE-2026-23721 is an information disclosure vulnerability.
What versions of OpenProject are vulnerable to CVE-2026-23721?
OpenProject versions before 16.6.5 and 17.0.0 are vulnerable to CVE-2026-23721.