# CVE-2026-3431: Sim Studio AI - MongoDB SSRF and Arbitrary Document Deletion

> Unauthenticated attackers can exploit MongoDB endpoints to connect to arbitrary instances and read, modify, or delete data.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 Mar 2026
- **Updated:** 2 Mar 2026
- **Also known as:** GHSA-h3j6-r52w-6956

## What is CVE-2026-3431?

CVE-2026-3431 is a critical server-side request forgery vulnerability in SimStudioAI sim, published on 2 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

On SimStudio version below to 0.5.74, the MongoDB tool endpoints accept arbitrary connection parameters from the caller without authentication or host restrictions. An attacker can leverage these endpoints to connect to any reachable MongoDB instance and perform unauthorized operations including reading, modifying, and deleting data.

Weakness: CWE-862 (Missing Authorization)

## Which versions are affected by CVE-2026-3431?

It affects 1 product.


Products: Sim Sim.

## How do I fix CVE-2026-3431?

No fix has been published for CVE-2026-3431 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-3431 being exploited?

There is no known exploitation of CVE-2026-3431 in the wild and no public exploit code.

## Other vulnerabilities in SimStudioAI sim

- [CVE-2026-3432](https://insights.sbomify.com/CVE-2026-3432/): Sim Studio AI - Unauthenticated OAuth Token Theft (critical 9.3)
- [CVE-2025-15099](https://insights.sbomify.com/CVE-2025-15099/): simstudioai sim CRON Secret internal.ts improper authentication (medium 6.9)
- [CVE-2025-7107](https://insights.sbomify.com/CVE-2025-7107/): SimStudioAI sim route.ts handleLocalFile path traversal (medium 6.9)
- [CVE-2025-7114](https://insights.sbomify.com/CVE-2025-7114/): SimStudioAI sim Session route.ts POST missing authentication (medium 6.9)
- [CVE-2025-10096](https://insights.sbomify.com/CVE-2025-10096/): SimStudioAI sim route.ts server-side request forgery (medium 5.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-3431 and fix it if it is affected.

What it is: CVE-2026-3431 is a critical server-side request forgery vulnerability in SimStudioAI sim, published on 2 Mar 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-2026-3431 in the wild and no public exploit code.

Affected product: SimStudioAI sim. 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-2026-3431/ (Markdown: https://insights.sbomify.com/CVE-2026-3431/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-3431
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-3431
- OSV: https://osv.dev/vulnerability/CVE-2026-3431

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-3431/
Summaries are generated and may contain mistakes; the official description above is the record.