An issue was discovered in the Sametime chat feature in the Notes 11.0 - 11.0.1 FP4 clients. An authenticated Sametime chat user could cause Remote Code Execution on another chat client by sending a specially formatted message through chat containing Javascript code.

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.