CVE-2026-23721 OpenProject users with "View Members" permission in any project can view all Group memberships
Users with View Members permission in any project can improperly enumerate all groups and their members, exposing sensitive membership 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-2026-23721?
CVE-2026-23721 is a medium-severity missing authorization vulnerability in opf openproject, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-23721?
It affects 1 product.
Products include Openproject Openproject.
How do I fix CVE-2026-23721?
No fix has been published for CVE-2026-23721 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-2026-23721 being exploited?
There is no known exploitation of CVE-2026-23721 in the wild and no public exploit code.
Other vulnerabilities in opf openproject
- CVE-2026-34717 OpenProject: SQL Injection in Cost Reporting =n Operator via parse_number_string
- CVE-2026-25763 Command Injection on OpenProject repositories leads to Remote Code Execution
- CVE-2026-24685 OpenProject has Argument Injection on Repository module that allows Arbitrary File Write
- CVE-2026-32698 OpenProject has a SQL Injection via Custom Field Name that can be chained to Remote Code Execution
- CVE-2026-32703 OpenProject's repository files are served with the MIME type allowing them to be used to bypass Content Security Policy
Sources
Also known as GHSA-vj77-wrc2-5h5h.