CVE-2026-13422: Harmonic Design Hd Quiz

Medium severity, CVSS 4.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Harmonic Design Hd Quiz: from 2.2.0, up to and including 2.2.1

Published 2026-06-27. Last modified 2026-06-29.