The API endpoints in Ironman PowerShell Universal 3.0.0 through 4.2.0 allow remote attackers to execute arbitrary commands via crafted HTTP requests if a param block is used, due to invalid sanitization of input strings. The fixed versions are 3.10.2, 4.1.10, and 4.2.1.
https://docs.powershelluniversal.com/changelogs/changelog
https://blog.ironmansoftware.com/powershell-universal-apis-cve/