CVE-2021-42078: PHP Event Calendar Project PHP Event Calendar

Medium severity, CVSS 6.1. EPSS: 0.9% chance of exploitation in the next 30 days.

PHP Event Calendar through 2021-11-04 allows persistent cross-site scripting (XSS), as demonstrated by the /server/ajax/events_manager.php title parameter. This can be exploited by an adversary in multiple ways, e.g., to perform actions on the page in the context of other users, or to deface the site.

Affected products

• PHP Event Calendar Project PHP Event Calendar: version 2021-11-04 only

Published 2021-11-08. Last modified 2026-06-17.