In Umbraco UmbracoForms through 8.13.16, an authenticated attacker can supply a malicious WSDL (aka Webservice) URL as a data source for remote code execution.
https://github.com/advisories/GHSA-vrgw-pc9c-qrrc
https://www.nuget.org/packages/UmbracoForms
https://our.umbraco.com/packages/developer-tools/umbraco-forms/