CVE-2026-3427 | THREATINT

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 the the `jsonText` block attribute in all versions up to, and including, 27.1.1 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.

PUBLISHED Reserved 2026-03-02 | Published 2026-03-22 | Updated 2026-03-22 | Assigner Wordfence

MEDIUM: 6.4CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation (‘Cross-site Scripting’)

Product status

Default status
unaffected

* (semver)
affected

Timeline

Credits

Osvaldo Noe Gonzalez Del Rio finder

References

www.wordfence.com/…-5716-49e0-a04e-d0dae527fcfc?source=cve

plugins.trac.wordpress.org/…rc/generators/schema/howto.php

plugins.trac.wordpress.org/…27.0/inc/class-wpseo-utils.php

github.com/Yoast/wordpress-seo/pull/23035

plugins.trac.wordpress.org/changeset/3475308/wordpress-seo

cve.org (CVE-2026-3427)

nvd.nist.gov (CVE-2026-3427)

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