A vulnerability in the legacy chat component of Mitel MiContact Center Business through 10.0.0.4 could allow an unauthenticated attacker to conduct a reflected cross-site scripting (XSS) attack due to insufficient input validation. A successful exploit could allow an attacker to access sensitive information and gain unauthorized access.
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-24-0002