CVE-2025-13619: Cmssuperheroes Flex Store Users

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

The Flex Store Users plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.1.0. This is due to the 'fsUserHandle::signup' and the 'fsSellerRole::add_role_seller' functions not restricting what user roles a user can register with. This makes it possible for unauthenticated attackers to supply the 'administrator' role during registration and gain administrator access to the site. Note: The vulnerability can be exploited with the 'fs_type' parameter if the Flex Store Seller plugin is also activated.

Affected products

• Cmssuperheroes Flex Store Users: up to and including 1.1.0

Published 2025-12-20. Last modified 2026-06-17.