# CVE-2026-57206: SimpleChat plugin validation endpoints missing authentication and authorization

> Unauthenticated attackers can access admin plugin validation and repair endpoints due to missing runtime authorization checks in SimpleChat.

- **Severity:** High 8.6 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Jul 2026
- **Updated:** 16 Jul 2026
- **Also known as:** GHSA-g6gr-xp46-hrmj

## What is CVE-2026-57206?

CVE-2026-57206 is a high-severity missing authorization vulnerability in microsoft simplechat, published on 16 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

SimpleChat is a secure AI conversation application with personal and group workspaces for document-grounded interactions. Prior to 0.241.206, several plugin validation routes in application/single_app/plugin_validation_endpoint.py, including `POST /api/admin/plugins/test-instantiation`, `GET /api/admin/plugins/health-check/<plugin_name>`, `POST /api/admin/plugins/repair/<plugin_name>`, and `POST /api/plugins/validate`, relied on @swagger_route(security=get_auth_security()) documentation without enforcing @login_required, @user_required, or @admin_required at runtime, allowing unauthenticated or unauthorized clients to invoke plugin validation, health, and repair behavior. This issue is fixed in version 0.241.206.

Weakness: CWE-862 (Missing Authorization), CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-57206?


## How do I fix CVE-2026-57206?

No fix has been published for CVE-2026-57206 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-57206 being exploited?

There is no known exploitation of CVE-2026-57206 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-57206 and fix it if it is affected.

What it is: CVE-2026-57206 is a high-severity missing authorization vulnerability in microsoft simplechat, published on 16 Jul 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-2026-57206 in the wild and no public exploit code.

Affected product: microsoft simplechat. 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-2026-57206/ (Markdown: https://insights.sbomify.com/CVE-2026-57206/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-57206
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-57206
- OSV: https://osv.dev/vulnerability/CVE-2026-57206

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-57206/
Summaries are generated and may contain mistakes; the official description above is the record.