What’s Vulnerable › Vulnerabilities
CVE-2026-23721: OpenProject users with "View Members" permission in any project can view all Group memberships
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-01-19 · updated 2026-06-17
- Weakness: CWE-862
Description
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 products
- opf openproject: before 16.6.5; 17.0.0 — fixed in 16.6.5
How to fix
Upgrade to a fixed version: opf openproject 16.6.5. Check the vendor advisory for mitigations.
References
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