In WhatsUp Gold versions released before 2023.1, a stored cross-site scripting (XSS) vulnerability has been identified. It is possible for an attacker to craft a XSS payload and store that value within Alert Center. If a WhatsUp Gold user interacts with the crafted payload, the attacker would be able to execute malicious JavaScript within the context of the victims browser.
https://www.progress.com/network-monitoring
https://community.progress.com/s/article/WhatsUp-Gold-Security-Bulletin-December-2023