A vulnerability in the conferencing component of Mitel MiVoice Connect through 19.3 SP2, 22.24.1500.0 could allow an unauthenticated attacker to conduct a reflected cross-site scripting (XSS) attack due to insufficient validation for the test_presenter.php page. A successful exploit could allow an attacker to execute arbitrary scripts.
https://www.mitel.com/support/security-advisories/mitel-product-security-advisory-23-0003