Stored Cross-Site Scripting Vulnerability in Yoast SEO Plugin for WordPress
CVE-2026-3427

6.4MEDIUM

Key Information:

Vendor

WordPress
Status
Yoast Seo – Advanced Seo With Real-time Guidance And Built-in Ai
Vendor
CVE Published:
22 March 2026

What is CVE-2026-3427?

The Yoast SEO plugin for WordPress contains a vulnerability that allows authenticated users with Contributor-level access or higher to exploit the plugin via the jsonText block attribute. This insufficient input sanitization and output escaping results in the potential injection of arbitrary web scripts into pages. When these pages are accessed by users, the injected scripts can execute, compromising site security and possibly leading to further exploitation.

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Deploy the Patch

Affected Version(s)

Yoast SEO – Advanced SEO with real-time guidance and built-in AI * <= 27.1.1

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/wordpress-seo/...
https://plugins.trac.wordpress.org/browser/wordpress-seo/...

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Osvaldo Noe Gonzalez Del Rio
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