Deserialization of Untrusted Data in the anti CSRF module in Sitecore through 9.1 allows an authenticated attacker to execute arbitrary code by sending a serialized .NET object in an HTTP POST parameter.
In Sitecore 8.2, there is absolute path traversal via the shell/Applications/Layouts/IDE.aspx fi parameter and the admin/LinqScratchPad.aspx Reference parameter.