PT-2026-26964 · WordPress · Yoast Seo

Published 2026-03-22 · Updated 2026-03-22 · CVE-2026-3427

Positive Technologies (AI Summary)

CVSS v3.1

6.4

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Name of the Vulnerable Software and Affected Versions Yoast SEO – Advanced SEO with real-time guidance and built-in AI plugin for WordPress versions prior to 27.1.2

Description The Yoast SEO plugin for WordPress is susceptible to Stored Cross-Site Scripting due to inadequate input sanitization and output escaping. This allows authenticated attackers with Contributor-level access or higher to inject malicious web scripts into pages. When a user accesses an injected page, the scripts will execute. The vulnerability resides in the jsonText block attribute.

Recommendations Versions prior to 27.1.2 should be updated.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-3427

Affected Products

Yoast Seo

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-3427 · Security Note
• https://github.com/Yoast/wordpress-seo/pull/23035 · Note
• https://twitter.com/CVEnew/status/2035619710751150388 · Twitter Post
• https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.0/src/generators/schema/howto.php#L125 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/fee1fef5-5716-49e0-a04e-d0dae527fcfc?source=cve · Note
• https://twitter.com/VulmonFeeds/status/2035578978182857130 · Twitter Post
• https://twitter.com/CVEarity/status/2035715119523794949 · Twitter Post
• https://plugins.trac.wordpress.org/changeset/3475308/wordpress-seo · Note
• https://plugins.trac.wordpress.org/browser/wordpress-seo/tags/27.0/inc/class-wpseo-utils.php#L915 · Note