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TI-2026-19094 Aliases CVE-2026-23721

OpenProject users with "View Members" permission in any project can view all Group memberships

Priority LOW 19CWE-862Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00209 11th percentileScored 2026-11-07
Fix Fixed openproject (opf): 16.6.5

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
opfopenprojectbefore 16.6.5; = 17.0.016.6.5Patch availableCNA
  • openproject Vendoropf Affected before 16.6.5; = 17.0.0 Fixed in 16.6.5 Patch available CNA

CPE configurations NVD · 2

CPEVersionsRoleVendor
cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*before 16.6.5Vulnerableopf
cpe:2.3:a:openproject:openproject:17.0.0:*:*:*:*:*:*:*17.0.0Vulnerableopf
  • cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:* Versions before 16.6.5 Vulnerable ·opf
  • cpe:2.3:a:openproject:openproject:17.0.0:*:*:*:*:*:*:* Versions 17.0.0 Vulnerable ·opf

Remediation

  • Fix · CNA openproject (opf) Fixed in 16.6.5

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-23721

References

Advisory 1

  • TI-2019-08673 A SQL injection vulnerability in the activities API in OpenProject before 8.3.2 allows a… CVSS 3.0HIGH 8.1
  • TI-2026-26047 OpenProject: 2FA OTP Verification Missing Rate Limiting CVSS 3.1HIGH 7.4
  • TI-2026-29552 OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup CVSS 3.1HIGH 7.1
  • TI-2023-14850 OpenProject user sessions not terminated after activation of 2FA CVSS 3.1MEDIUM 6.5
  • TI-2026-18162 OpenProject is Vulnerable to Code Execution in E-Mail function CVSS 4.0HIGH 8.6
  • TI-2026-26961 OpenProject: SQL Injection in Cost Reporting =n Operator via parse_number_string CVSS 3.1CRITICAL 9.9
See all 36 →

Sources

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