# CVE-2025-9800: SimStudioAI sim HTML File route.ts import unrestricted upload

> Attackers can upload malicious HTML files via the import function, potentially leading to code execution or privilege escalation.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P`)
- **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:** 1 Sep 2025
- **Updated:** 2 Sep 2025
- **Also known as:** GHSA-g7mj-wwxq-p2gr

## What is CVE-2025-9800?

CVE-2025-9800 is a medium-severity vulnerability in SimStudioAI sim, published on 1 Sep 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A weakness has been identified in SimStudioAI sim up to ed9b9ad83f1a7c61f4392787fb51837d34eeb0af. Affected by this issue is the function Import of the file apps/sim/app/api/files/upload/route.ts of the component HTML File Parser. Executing manipulation of the argument File can lead to unrestricted upload. The attack may be launched remotely. The exploit has been made available to the public and could be exploited. This product operates on a rolling release basis, ensuring continuous delivery. Consequently, there are no version details for either affected or updated releases. This patch is called 45372aece5e05e04b417442417416a52e90ba174. A patch should be applied to remediate this issue.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type), CWE-284 (Improper Access Control)

## Which versions are affected by CVE-2025-9800?

It affects 1 product.


Products: Sim Sim.

## How do I fix CVE-2025-9800?

No fix has been published for CVE-2025-9800 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-9800 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-9800 exists.

## Other vulnerabilities in SimStudioAI sim

- [CVE-2026-3431](https://insights.sbomify.com/CVE-2026-3431/): Sim Studio AI - MongoDB SSRF and Arbitrary Document Deletion (critical 9.8)
- [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)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-9800 and fix it if it is affected.

What it is: CVE-2025-9800 is a medium-severity vulnerability in SimStudioAI sim, published on 1 Sep 2025. 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-2025-9800 exists.

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-2025-9800/ (Markdown: https://insights.sbomify.com/CVE-2025-9800/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-9800
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-9800
- OSV: https://osv.dev/vulnerability/CVE-2025-9800

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-9800/
Summaries are generated and may contain mistakes; the official description above is the record.