How severe is CVE-2026-22604?

CVE-2026-22604 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2026-22604 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-22604?

CVE-2026-22604 affects Openproject. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-22604?

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

Does CVE-2026-22604 have an EU (EUVD) identifier?

Yes. CVE-2026-22604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1883.

When was CVE-2026-22604 published?

CVE-2026-22604 was published on 2026-01-10 and last updated on 2026-06-17.

CVE-2026-22604

CVE-2026-22604 is a medium-severity vulnerability in Openproject with a CVSS 3.x base score of 5.3. 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-200.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 6.9
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1883
Weakness: CWE-200
Affected product: Openproject
Published: 2026-01-10
Last modified: 2026-06-17

Description

OpenProject is an open-source, web-based project management software. For OpenProject versions from 11.2.1 to before 16.6.2, when sending a POST request to the /account/change_password endpoint with an arbitrary User ID as the password_change_user_id parameter, the resulting error page would show the username for the requested user. Since this endpoint is intended to be called without being authenticated, this allows to enumerate the user names of all accounts registered in an OpenProject instance. This issue has been patched in version 16.6.2.

Frequently asked questions

What is CVE-2026-22604?: OpenProject is an open-source, web-based project management software. For OpenProject versions from 11.2.1 to before 16.6.2, when sending a POST request to the /account/change_password endpoint with an arbitrary User ID as the password_change_user_id parameter, the resulting error page would show the username for the requested user. Since this endpoint is intended to be called without being authenticated, this allows to enumerate the user names of all accounts registered in an OpenProject instance. This issue has been patched in version 16.6.2.
How severe is CVE-2026-22604?: CVE-2026-22604 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2026-22604 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-22604?: CVE-2026-22604 affects Openproject. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-22604?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-22604 have an EU (EUVD) identifier?: Yes. CVE-2026-22604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1883.
When was CVE-2026-22604 published?: CVE-2026-22604 was published on 2026-01-10 and last updated on 2026-06-17.

References

Affected products (1)

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

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