CVE-2021-24943: Roundupwp Registrations For The Events Calendar

Critical severity, CVSS 9.8. EPSS: 7.3% chance of exploitation in the next 30 days.

The Registrations for the Events Calendar WordPress plugin before 2.7.6 does not sanitise and escape the event_id in the rtec_send_unregister_link AJAX action (available to both unauthenticated and authenticated users) before using it in a SQL statement, leading to an unauthenticated SQL injection.

Affected products

• Roundupwp Registrations For The Events Calendar: before 2.7.6 (fixed in 2.7.6)

Published 2021-12-06. Last modified 2026-06-17.