Auth bypass in Openproject
CVE-2026-23721
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.002 (9.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Openproject — versions 17.0.0
- Opf Openproject — versions < 16.6.5, = 17.0.0
Weakness classification (CWE)
References
- github.com/opf/openproject/security/advisories/GHSA-vj77-wrc2-5h5h (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-23721?
- CVE-2026-23721 is a medium-severity vulnerability in Openproject, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-01-19.
- How severe is CVE-2026-23721?
- Medium severity. CVSS v3 base score is 4.3 out of 10.