CVE-2021-24556: Email-Subscriber Project Email-Subscriber

Medium severity, CVSS 6.1. EPSS: 1.3% chance of exploitation in the next 30 days.

The kento_email_subscriber_ajax AJAX action of the Email Subscriber WordPress plugin through 1.1, does not properly sanitise, validate and escape the submitted subscribe_email and subscribe_name POST parameters, inserting them in the DB and then outputting them back in the Subscriber list (/wp-admin/edit.php?post_type=kes_campaign&page=kento_email_subscriber_list_settings), leading a Stored XSS issue.

Affected products

• Email-Subscriber Project Email-Subscriber: up to and including 1.1

Published 2021-08-23. Last modified 2026-06-17.