# CVE-2026-23721: OpenProject users with "View Members" permission in any project can view all Group memberships

> Users with View Members permission in any project can improperly enumerate all groups and their members, exposing sensitive membership data.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 19 Jan 2026
- **Updated:** 20 Jan 2026
- **Also known as:** GHSA-vj77-wrc2-5h5h

## What is CVE-2026-23721?

CVE-2026-23721 is a medium-severity missing authorization vulnerability in opf openproject, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenProject is an open-source, web-based project management software. When using groups in OpenProject to manage users, the group members should only be visible to users that have the View Members permission in any project that the group is also a member of. Prior to versions 17.0.1 and 16.6.5, due to a failed permission check, if a user had the View Members permission in any project, they could enumerate all Groups and view which other users are part of the group. The issue has been fixed in OpenProject 17.0.1 and 16.6.5. No known workarounds are available.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-23721?

It affects 1 product.


Products: Openproject Openproject.

## How do I fix CVE-2026-23721?

No fix has been published for CVE-2026-23721 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23721 being exploited?

There is no known exploitation of CVE-2026-23721 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-2026-23721 and fix it if it is affected.

What it is: CVE-2026-23721 is a medium-severity missing authorization vulnerability in opf openproject, published on 19 Jan 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-23721 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-2026-23721/ (Markdown: https://insights.sbomify.com/CVE-2026-23721/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23721
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23721
- OSV: https://osv.dev/vulnerability/CVE-2026-23721

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23721/
Summaries are generated and may contain mistakes; the official description above is the record.