CVE-2026-11780: Expresstech Quiz And Survey Master Qsm – Quiz Maker & Survey Maker

Medium severity, CVSS 6.4. EPSS: 0.4% chance of exploitation in the next 30 days.

The Quiz and Survey Master (QSM) – Easy Quiz and Survey Maker plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'question_title' parameter in all versions up to, and including, 11.2.1 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.

Affected products

• Expresstech Quiz And Survey Master Qsm – Quiz Maker & Survey Maker: up to and including 11.2.1

Published 2026-08-16. Last modified 2026-08-20.