CVE-2021-24927: My Calendar Project My Calendar

Medium severity, CVSS 5.4. EPSS: 0.6% chance of exploitation in the next 30 days.

The My Calendar WordPress plugin before 3.2.18 does not sanitise and escape the callback parameter of the mc_post_lookup AJAX action (available to any authenticated user) before outputting it back in the response, leading to a Reflected Cross-Site Scripting issue

Affected products

Published 2021-11-29. Last modified 2026-06-17.