# CVE-2026-40896: OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup

> An attacker with agenda management rights in one project can inject items into meetings in other projects they cannot access.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/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:** 20 Apr 2026
- **Updated:** 20 Apr 2026
- **Also known as:** GHSA-hh5p-gwf8-h245

## What is CVE-2026-40896?

CVE-2026-40896 is a medium-severity missing authorization vulnerability in opf openproject, published on 20 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key), CWE-367 (Time-of-check Time-of-use (TOCTOU) Race Condition)

## Which versions are affected by CVE-2026-40896?

It affects 1 product.


Products: Openproject Openproject.

## How do I fix CVE-2026-40896?

No fix has been published for CVE-2026-40896 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40896 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40896 exists.

## 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-2026-40896 and fix it if it is affected.

What it is: CVE-2026-40896 is a medium-severity missing authorization vulnerability in opf openproject, published on 20 Apr 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40896 exists.

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-2026-40896/ (Markdown: https://insights.sbomify.com/CVE-2026-40896/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40896
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40896
- OSV: https://osv.dev/vulnerability/CVE-2026-40896

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40896/
Summaries are generated and may contain mistakes; the official description above is the record.