How severe is CVE-2026-23721?

CVE-2026-23721 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-23721 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-23721?

CVE-2026-23721 primarily affects Openproject. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-23721?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-23721 have an EU (EUVD) identifier?

Yes. CVE-2026-23721 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3307.

When was CVE-2026-23721 published?

CVE-2026-23721 was published on 2026-01-19 and last updated on 2026-06-17.

CVE-2026-23721

CVE-2026-23721 is a medium-severity vulnerability in Openproject with a CVSS 3.x base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: Medium (CVSS 3.x base score 4.3)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-3307
Weakness: CWE-862
Affected product: Openproject
Published: 2026-01-19
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-23721?: CVE-2026-23721 has a CVSS 3.x base score of 4.3, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-23721 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-23721?: CVE-2026-23721 primarily affects Openproject. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-23721?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-23721 have an EU (EUVD) identifier?: Yes. CVE-2026-23721 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-3307.
When was CVE-2026-23721 published?: CVE-2026-23721 was published on 2026-01-19 and last updated on 2026-06-17.

References

https://github.com/opf/openproject/security/advisories/GHSA-vj77-wrc2-5h5h

Affected products (2)

cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*
cpe:2.3:a:openproject:openproject:17.0.0:*:*:*:*:*:*:*

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