Track vulnerabilities like this one. Sign up free to get alerted when software you use is affected.

CVE-2026-22604: OpenProject reveals usernames through password reset

CVE-2026-22604 · published 9 months ago

Summary

Versions of OpenProject from 11.2.1 up to 16.6.1 let anyone request a password change and see the real username on the error page. This means an outsider can discover all registered user names. Upgrade to version 16.6.2 or later to stop this information leak.

What to do

Update openproject openproject to version 16.6.2 or later.

Affected software

Vendor	Product	Affected versions
openproject	openproject	>= 11.2.1, < 16.6.2 `cpe:2.3:a:openproject:openproject::::::::`

Original advisory text

OpenProject is vulnerable to user enumeration via the change password function

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.

References

https://github.com/opf/openproject/releases/tag/v16.6.2 URL
https://github.com/opf/openproject/security/advisories/GHSA-q7qp-p3vw-j2fh Vendor Advisory
https://github.com/opf/openproject/commit/2cff5e98649e32a197a62659a23dd4b864b785... Patch
https://github.com/opf/openproject/pull/3451 Patch
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22604... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-22604 Vendor Advisory

Fix within

Internet-facing 14 days

Internal 60 days

Not known to be exploited
Can be exploited automatically
Gives an attacker partial control

Severity

7.8 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-200Information Exposure

Timeline

Published10 Jan 2026

Updated4 Nov 2026

First seen7 Mar 2026

Sources

CVE-2026-22604 · NVD

CVE-2026-22604 · OSV

GHSA-q7qp-p3vw-j2fh · GHSA

Track software like this

Free during beta