WordPress Plugin Availability Calendar Cross-Site Scripting - CVE-2021-24604
WordPress Plugin Availability Calendar is prone to a cross-site scripting vulnerability because it fails to properly sanitize user-supplied input. An attacker may leverage this issue to execute arbitrary script code 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. WordPress Plugin Availability Calendar version 1.2.1 is vulnerable prior versions may also be affected.