CVE-2026-23721— OpenProject users with "View Members" permission in any project can view all Group memberships
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I. Basic Information for CVE-2026-23721
Vulnerability Information
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Vulnerability Title
OpenProject users with "View Members" permission in any project can view all Group memberships
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
OpenProject 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 17.0.1之前版本和16.6.5之前版本存在安全漏洞，该漏洞源于权限检查失败，可能导致拥有查看成员权限的用户枚举所有群组及其成员。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| opf | openproject | < 16.6.5 | - |
II. Public POCs for CVE-2026-23721
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · opf · 2026-01-19 · 3 CVEs total
| CVE-2026-23625 | 8.7 HIGH | OpenProject has stored XSS regression using attachments and script-src self |
| CVE-2026-23646 | 6.5 MEDIUM | OpenProject users can delete other user's session, causing them to be logged out |
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Same weakness: CWE-862
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V. Comments for CVE-2026-23721
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