A vulnerability in the legacy chat component of Mitel MiContact Center Business through 10.1.0.4 could allow an unauthenticated attacker to conduct an unauthorized access attack due to inadequate access control checks. A successful exploit requires user interaction and could allow an attacker to access sensitive information and send unauthorized messages during an active chat session.
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-24-0024