CVE-2026-13422

The HD Quiz plugin for WordPress is vulnerable to Cross-Site Request Forgery in versions 2.2.0 to 2.2.1. This is due to missing or incorrect nonce validation on the hdq_validate_nonce function. This makes it possible for unauthenticated attackers to delete or modify quizzes and questions, create new quizzes, and change plugin settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.

• CWE-352

• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/actions-ajax.php#L155
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/actions-ajax.php#L179
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/actions-ajax.php#L53
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/actions-ajax.php#L68
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/actions-ajax.php#L7
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/actions-ajax.php#L87
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.0/includes/functions.php#L39
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/actions-ajax.php#L155
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/actions-ajax.php#L179
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/actions-ajax.php#L53
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/actions-ajax.php#L68
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/actions-ajax.php#L7
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/actions-ajax.php#L87
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.1/includes/functions.php#L39
• https://plugins.trac.wordpress.org/browser/hd-quiz/tags/2.2.2/includes/functions.php#L40
• https://www.wordfence.com/threat-intel/vulnerabilities/id/c886ce5a-0633-4892-9471-c1a7ee858c93?source=cve

Published

Jun 27, 2026

Last Modified

Jun 29, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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