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.
References8
- plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admi…
- plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.6/admi…
- plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admi…
- plugins.trac.wordpress.org/browser/wordpress-seo/tags/28.0/admi…
- plugins.trac.wordpress.org/changeset/3598937/wordpress-seo/trun…
- plugins.trac.wordpress.org/changeset?old_path=%2Fwordpress-seo/…
- research.cleantalk.org/cve-2026-15425
- www.wordfence.com/threat-intel/vulnerabilities/id/4b2fa1b7-a5af…
Metrics
- CVSS 3.1
-
6.4
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 30 · as of 14 November 2026
- CWE
- CWE-79
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.