CVE-2026-59544: Thrive Themes Coupon Thrive Quiz Builder

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Unauthenticated PHP Object Injection in Thrive Quiz Builder <= 10.9.3.0 versions.

Affected products

• Thrive Themes Coupon Thrive Quiz Builder: up to and including 10.9.3.0

Published 2026-07-23. Last modified 2026-07-23.