# CVE-2020-22755: MCMS vulnerable to arbitrary code execution via crafted thumbnail


- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Fix available:** No
- **Published:** 8 May 2023
- **Updated:** 29 Jan 2025
- **Also known as:** GHSA-293v-5329-36wp

## What is CVE-2020-22755?

CVE-2020-22755 is a high-severity vulnerability in n/a, published on 8 May 2023. 

### Official description

File upload vulnerability in MCMS 5.0 allows attackers to execute arbitrary code via a crafted thumbnail. A different vulnerability than CVE-2022-31943.

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

## Which versions are affected by CVE-2020-22755?

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 5.0.0 | None |
| `net.mingsoft:ms-mcms` | Maven | All versions to 5.0.0 | None |

Products: Mingsoft Mcms.

## How do I fix CVE-2020-22755?

No fix has been published for CVE-2020-22755 yet. Limit exposure of the affected software until one is available.

## Is CVE-2020-22755 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-22755 exists.

## 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-2020-22755 and fix it if it is affected.

What it is: CVE-2020-22755 is a high-severity vulnerability in n/a, published on 8 May 2023. 
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-22755 exists.

Affected packages and fixed versions:
- net.mingsoft:ms-mcms (Maven): affected all versions up to 5.0.0; no fix listed
- net.mingsoft:ms-mcms (Maven): affected all versions up to 5.0.0; 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-2020-22755/ (Markdown: https://insights.sbomify.com/CVE-2020-22755/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2020-22755
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2020-22755
- OSV: https://osv.dev/vulnerability/CVE-2020-22755

---
From sbomify Insights: https://insights.sbomify.com/CVE-2020-22755/
Summaries are generated and may contain mistakes; the official description above is the record.