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CVE-2026-22604— OpenProject is vulnerable to user enumeration via the change password function

Quick assessment

Affected
opf openproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 11.2.1版本至16.6.2之前版本存在信息泄露漏洞，该漏洞源于错误页面泄露用户名信息，可能导致账户枚举。

AI Predicted 5.3 Difficulty: Trivial EPSS 0.29% · P20

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery
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I. Basic Information for CVE-2026-22604

Vulnerability Information
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Vulnerability Title
OpenProject is vulnerable to user enumeration via the change password function
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
OpenProject 信息泄露漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenProject是OpenProject开源的一个基于Web的项目管理软件。 OpenProject 11.2.1版本至16.6.2之前版本存在信息泄露漏洞，该漏洞源于错误页面泄露用户名信息，可能导致账户枚举。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
opf openproject >= 11.2.1, < 16.6.2 -

II. Public POCs for CVE-2026-22604

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III. Intelligence Information for CVE-2026-22604

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Other References for CVE-2026-22604 (1)

Same Patch Batch · opf · 2026-01-10 · 6 CVEs total

CVE-2026-22600 9.1 CRITICAL OpenProject is Vulnerable to Arbitrary File Read via ImageMagick SVG Coder
CVE-2026-22605 4.3 MEDIUM OpenProject is Vulnerable to Insecure Direct Object Reference in Meetings
CVE-2026-22602 3.5 LOW OpenProject is Vulnerable to User Enumeration via User ID
CVE-2026-22601 OpenProject is Vulnerable to Code Execution in E-Mail function
CVE-2026-22603 OpenProject has no protection against brute-force attacks in the Change Password function

IV. Related Vulnerabilities

Same product: openproject
Same vendor: opf
Same weakness: CWE-200

V. Comments for CVE-2026-22604

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