HCL Sametime is vulnerable to broken server-side validation. While the application performs client-side input checks, these are not enforced by the web server. An attacker can bypass these restrictions by sending manipulated HTTP requests directly to the server.

HCL Sametime is impacted by insecure services in-use on the UIM client by default. An unused legacy REST service was enabled by default using the HTTP protocol. An attacker could potentially use this service endpoint maliciously.

Sametime Connect desktop chat client includes, but does not use or require, the use of an Eclipse feature called Secure Storage. Using this Eclipse feature to store sensitive data can lead to exposure of that data.

This vulnerability allows users to execute a clickjacking attack in the meeting's chat.

Information leakage occurs when a website reveals information that could aid an attacker to further exploit the system. This information may or may not be sensitive and does not automatically mean a breach is likely to occur. Overall, any information that could be used for an attack should be limited whenever possible.