What the vulnerability does
01Description
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 `yoast-schema` block attribute in all versions up to, and including, 26.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Explanation of Vulnerability in Simple Terms
02Summary
Yoast SEO versions up to 26.8 contain a cross-site scripting (XSS) vulnerability that allows authenticated users to inject malicious scripts affecting other users on the site. The vulnerability has a changed scope, meaning the impact extends beyond the plugin itself. Site administrators should update to a version newer than 26.8 as soon as a patch becomes available.
What an attacker can do
03Attacker Capabilities
Inject malicious scripts that execute in other users' browsers and affect site functionality.
Potential impact on your site
04Site Impact
Authenticated attackers can inject scripts affecting other users' sessions and site behavior without requiring user interaction.
Conditions required to exploit
05Prerequisites
Attacker must have a low-privilege account (e.g., contributor or editor) on the WordPress site.
Key dates
06Disclosure timeline
February 6, 2026
CVE published
April 8, 2026
Record updated
