Sourcecodester Online Event Booking and Reservation System 2.3.0 contains a cross-site scripting vulnerability in PHP/MySQL via the msg parameter to /event-management/index.php. An attacker can leverage this vulnerability in order to change the visibility of the website. Once the target user clicks on a given link, the content of the HTML code of the attacker’s choice displays.
View the template here CVE-2021-42663.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2021-42663