Umbraco CMS 4.11.8 through 7.15.10, and 7.12.4, allows Remote Code Execution by authenticated administrators via msxsl:script in an xsltSelection to developer/Xslt/xsltVisualize.aspx.
https://www.exploit-db.com/exploits/46153
https://github.com/noraj/Umbraco-RCE