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

> Unauthenticated attackers can enumerate registered usernames via the change password endpoint, exposing user account information.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 10 Jan 2026
- **Updated:** 12 Jan 2026
- **Also known as:** GHSA-q7qp-p3vw-j2fh

## What is CVE-2026-22604?

CVE-2026-22604 is a medium-severity vulnerability in opf openproject, published on 10 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-22604?

It affects 1 product.


Products: Openproject Openproject.

## How do I fix CVE-2026-22604?

No fix has been published for CVE-2026-22604 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-22604 being exploited?

There is no known exploitation of CVE-2026-22604 in the wild and no public exploit code.

## Other vulnerabilities in opf openproject

- [CVE-2026-34717](https://insights.sbomify.com/CVE-2026-34717/): OpenProject: SQL Injection in Cost Reporting =n Operator via parse_number_string (critical 9.9)
- [CVE-2026-25763](https://insights.sbomify.com/CVE-2026-25763/): Command Injection on OpenProject repositories leads to Remote Code Execution (critical 9.4)
- [CVE-2026-24685](https://insights.sbomify.com/CVE-2026-24685/): OpenProject has Argument Injection on Repository module that allows Arbitrary File Write (critical 9.4)
- [CVE-2026-32698](https://insights.sbomify.com/CVE-2026-32698/): OpenProject has a SQL Injection via Custom Field Name that can be chained to Remote Code Execution (critical 9.1)
- [CVE-2026-32703](https://insights.sbomify.com/CVE-2026-32703/): OpenProject's repository files are served with the MIME type allowing them to be used to bypass Content Security Policy (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-22604 and fix it if it is affected.

What it is: CVE-2026-22604 is a medium-severity vulnerability in opf openproject, published on 10 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-22604 in the wild and no public exploit code.

Affected product: opf openproject. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-22604/ (Markdown: https://insights.sbomify.com/CVE-2026-22604/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-22604
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-22604
- OSV: https://osv.dev/vulnerability/CVE-2026-22604

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-22604/
Summaries are generated and may contain mistakes; the official description above is the record.