Vulnerability Description
The Yoast SEO – Advanced SEO with real-time guidance and built-in AI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Post Slug (post_name) in all versions up to, and including, 28.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires pretty permalinks to be enabled, as the exploit chain depends on get_permalink() embedding the stored percent-encoded post_name in the generated URL.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admin/class-b
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admin/class-b
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admin/class-b
- https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admin/class-b
- https://plugins.trac.wordpress.org/changeset/3598937/wordpress-seo/trunk/admin/c
- https://plugins.trac.wordpress.org/changeset?old_path=%2Fwordpress-seo/tags/28.0
- https://www.wordfence.com/threat-intel/vulnerabilities/id/4b2fa1b7-a5af-4ea6-9be
FAQ
What is CVE-2026-15425?
CVE-2026-15425 is a vulnerability with a CVSS score of 6.4 (MEDIUM). The Yoast SEO – Advanced SEO with real-time guidance and built-in AI plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Post Slug (post_name) in all versions up to, and including, 2...
How severe is CVE-2026-15425?
CVE-2026-15425 has been rated MEDIUM with a CVSS base score of 6.4/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-15425?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.