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CVE-2026-23721— OpenProject users with "View Members" permission in any project can view all Group memberships

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 4.3 · Medium EPSS 0.20% · P9
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-23721

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Vendor Advisories for CVE-2026-23721 (1)

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

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-862

V. Comments for CVE-2026-23721

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