CVE-2026-23721
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
2Description
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.
Analysis
OpenProject versions prior to 17.0.1 and 16.6.5 fail to properly validate permissions when displaying group membership information, allowing authenticated users with View Members permission in any project to enumerate all groups and identify their members across the entire system. This breaks the intended access control where group membership visibility should be restricted to users with appropriate permissions in projects where the group is active. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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