In Progress WhatsUp Gold prior to version 21.1.0, an application endpoint failed to adequately sanitize malicious input. which could allow an unauthenticated attacker to execute arbitrary code in a victim's browser.
https://knowledgebase.progress.com/articles/Knowledge/WhatsUp-Gold-Security-Bulletin-September-2021
http://packetstormsecurity.com/files/164359/WhatsUpGold-21.0.3-Cross-Site-Scripting.html