XSS in Yoast Seo – Advanced With Real-time Guidance And Built-in Ai
CVE-2026-3427
The Yoast SEO – Advanced SEO with real-time guidance and built-in AI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the the `jsonText` block attribute in all versions up to, and including, 27.1.1 due to insufficient…
Vulnerability class: XSS (Cross-Site Scripting)
EPSS: 0.000 (15.4th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Affected products
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/fee1fef5-5716-49e0-a04e-d0dae…
- plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.0/src/generators/schem…
- plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.0/inc/class-wpseo-util…
- github.com/Yoast/wordpress-seo/pull/23035
- plugins.trac.wordpress.org/changeset/3475308/wordpress-seo
Frequently asked questions
- What is CVE-2026-3427?
- CVE-2026-3427 is a medium-severity vulnerability in Yoast Seo – Advanced With Real-time Guidance And Built-in Ai, classified under Cross-site Scripting. CVSS score: 6.4/10. Published 2026-03-22.
- How severe is CVE-2026-3427?
- Medium severity. CVSS v3 base score is 6.4 out of 10.