Information disclosure in Openproject
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Openproject
- Opf Openproject — versions >= 11.2.1, < 16.6.2
Weakness classification (CWE)
References
- github.com/opf/openproject/security/advisories/GHSA-q7qp-p3vw-j2fh (Patch, Vendor Advisory)
- github.com/opf/openproject/pull/3451 (Issue Tracking)
- github.com/opf/openproject/commit/2cff5e98649e32a197a62659a23dd4b864b7855b (Patch)
- github.com/opf/openproject/releases/tag/v16.6.2 (Release Notes)
Frequently asked questions
- What is CVE-2026-22604?
- CVE-2026-22604 is a medium-severity vulnerability in Openproject, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-01-10.
- How severe is CVE-2026-22604?
- Medium severity. CVSS v3 base score is 5.3 out of 10.