Telerik UI Padding-Oracle Bug Chained to Unauthenticated RCE — Public Exploit Released
Mon Sep 07 2026
Patch Management
Vulnerability
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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