CVE-2026-22604

Name: CVE-2026-22604
Creator: NVD / NIST
Published: 2026-01-10T02:15:49.343+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.9/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2026-22604 is a medium-severity vulnerability rated 6.9/10 on the CVSS scale. 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. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

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

CVSS 4.0

6.9/10

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.25%

16.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Openproject	Openproject	>= 11.2.1, < 16.6.2

References

https://github.com/opf/openproject/commit/2cff5e98649e32a197a62659a23dd4b864b7855bPatch
https://github.com/opf/openproject/pull/3451Issue Tracking
https://github.com/opf/openproject/releases/tag/v16.6.2Release Notes
https://github.com/opf/openproject/security/advisories/GHSA-q7qp-p3vw-j2fhPatch, Vendor Advisory

Timeline

Published: Jan 10, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-22604?

How severe is CVE-2026-22604?

CVE-2026-22604 has a CVSS score of 6.9/10 (MEDIUM severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2026-22604?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-22604?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST