Calacode @Mail is prone to an HTML-injection vulnerability because it fails to sufficiently sanitize user-supplied data. An attacker can exploit this issue to execute arbitrary script code in the victim's browser, in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Other attacks are also possible. An attacker can exploit this issue by creating an email message containing malicious script code and sending it to a user of the vulnerable application.