HCL iNotes is susceptible to a Reflected Cross-site Scripting (XSS) vulnerability caused by improper validation of user-supplied input supplied with a form POST request. A remote attacker could exploit this vulnerability using a specially-crafted URL to execute script in a victim's web browser within the security context of the hosting web site and/or steal the victim's cookie-based authentication credentials.

HCL iNotes is susceptible to a link to non-existent domain vulnerability. An attacker could use this vulnerability to trick a user into supplying sensitive information such as username, password, credit card number, etc.

HCL iNotes is susceptible to a Tabnabbing vulnerability caused by improper sanitization of message content. A remote unauthenticated attacker could use this vulnerability to trick the end user into entering sensitive information such as credentials, e.g. as part of a phishing attack.