Monstra CMS 3.0.4 contains a cross-site scripting vulnerability via the page feature in admin/index.php. An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
View the template here CVE-2020-23697.yaml
References:
https://nvd.nist.gov/vuln/detail/CVE-2020-23697