Telerik UI Padding-Oracle Bug Chained to Unauthenticated RCE — Public Exploit Releasedhttps://thehackernews.com/2026/09/telerik-ui-padding-oracle-bug-chained.html
A TantoSec proof-of-concept turns an AES-CBC "padding oracle" in Telerik UI for ASP.NET AJAX into unauthenticated remote code execution — but only against applications in a specific non-default configuration, and Progress patched the chain in July. There are no confirmed reports of exploitation in the wild. Security firm TantoSec has published a working exploit chain targeting vulnerabilities