# CVE-2018-18830: Unrestricted Upload of File with Dangerous Type in mingsoft:ms-mcms

> Unauthenticated attackers can upload malicious JSP files by bypassing filename checks, leading to arbitrary code execution on the server.

- **Severity:** Critical 9.8 (`CVSS:3.0/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:** 30 Oct 2018
- **Updated:** 5 Aug 2024
- **Also known as:** GHSA-c7c7-xm8g-xm36

## What is CVE-2018-18830?

CVE-2018-18830 is a critical vulnerability in n/a, published on 30 Oct 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

An issue was discovered in com\mingsoft\basic\action\web\FileAction.java in MCMS 4.6.5. Since the upload interface does not verify the user login status, you can use this interface to upload files without setting a cookie. First, start an upload of JSP code with a .png filename, and then intercept the data packet. In the name parameter, change the suffix to jsp. In the response, the server returns the storage path of the file, which can be accessed to execute arbitrary JSP code.

Weakness: CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2018-18830?

2 open source packages ship an affected version, including net.mingsoft:ms-mcms. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `net.mingsoft:ms-mcms` | Maven | All versions to 4.6.5 | None |
| `net.mingsoft:ms-mcms` | Maven | All versions to 4.6.5 | None |

Products: Mingsoft Mcms.

## How do I fix CVE-2018-18830?

No fix has been published for CVE-2018-18830 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-18830 being exploited?

There is no known exploitation of CVE-2018-18830 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2025-56316](https://insights.sbomify.com/CVE-2025-56316/): MCMS vulnerable SQL injection via the content_title parameter (critical 9.8)
- [CVE-2025-29287](https://insights.sbomify.com/CVE-2025-29287/): MCMS allows arbitrary file uploads in the ueditor component (critical 9.8)
- [CVE-2023-50578](https://insights.sbomify.com/CVE-2023-50578/): Mingsoft MCMS SQL injection (critical 9.8)
- [CVE-2020-20913](https://insights.sbomify.com/CVE-2020-20913/): Ming-Soft MCMS vulnerable to SQL injection (critical 9.8)
- [CVE-2022-36272](https://insights.sbomify.com/CVE-2022-36272/): Mingsoft MCMS SQL injection vulnerability in /mdiy/page/verify URI via fieldName parameter (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-18830 and fix it if it is affected.

What it is: CVE-2018-18830 is a critical vulnerability in n/a, published on 30 Oct 2018. 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-2018-18830 in the wild and no public exploit code.

Affected packages and fixed versions:
- net.mingsoft:ms-mcms (Maven): affected all versions up to 4.6.5; no fix listed
- net.mingsoft:ms-mcms (Maven): affected all versions up to 4.6.5; no fix listed

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-2018-18830/ (Markdown: https://insights.sbomify.com/CVE-2018-18830/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-18830
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-18830
- OSV: https://osv.dev/vulnerability/CVE-2018-18830

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-18830/
Summaries are generated and may contain mistakes; the official description above is the record.