How severe is CVE-2026-40896?

CVE-2026-40896 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-40896 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-2026-40896?

CVE-2026-40896 affects Openproject. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-40896?

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

Does CVE-2026-40896 have an EU (EUVD) identifier?

Yes. CVE-2026-40896 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23870.

When was CVE-2026-40896 published?

CVE-2026-40896 was published on 2026-04-20 and last updated on 2026-06-17.

CVE-2026-40896

CVE-2026-40896 is a medium-severity vulnerability in Openproject with a CVSS 3.x base score of 6.5. 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-367.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-23870
Weakness: CWE-367
Affected product: Openproject
Published: 2026-04-20
Last modified: 2026-06-17

Description

OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.

Frequently asked questions

What is CVE-2026-40896?: OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.
How severe is CVE-2026-40896?: CVE-2026-40896 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-40896 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-2026-40896?: CVE-2026-40896 affects Openproject. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-40896?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40896 have an EU (EUVD) identifier?: Yes. CVE-2026-40896 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-23870.
When was CVE-2026-40896 published?: CVE-2026-40896 was published on 2026-04-20 and last updated on 2026-06-17.

References

Affected products (1)

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

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