What is the CVSS score of CVE-2026-23721?

CVE-2026-23721 has a CVSS 3.1 base score of 4.3 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Openproject are affected by CVE-2026-23721?

Organizations using OpenProject should be aware of moderate risk from CVE-2026-23721, a missing authorization vulnerability rated CVSS 4.3. Attackers could gain access beyond their authorized level.

How to fix or mitigate CVE-2026-23721?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Openproject CVE-2026-23721

MEDIUM

Missing Authorization (CWE-862)

2026-01-19 security-advisories@github.com

Authentication Bypass Openproject

4.3

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

4.3 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

CVE Published

Jan 19, 2026 - 18:16 nvd

MEDIUM 4.3

DescriptionGitHub Advisory

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.

AnalysisAI

OpenProject versions prior to 17.0.1 and 16.6.5 fail to properly validate permissions when displaying group membership information, allowing authenticated users with View Members permission in any project to enumerate all groups and identify their members across the entire system. This breaks the intended access control where group membership visibility should be restricted to users with appropriate permissions in projects where the group is active. The vulnerability requires authenticated access and has no available patch or workaround at this time.

Technical ContextAI

Classified as CWE-862 (Missing Authorization). Affects Openproject. 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 Op