Telerik UI Padding-Oracle Bug Chained to Unauthenticated RCE — Public Exploit Released

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

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id: 2927
uid: IyPrp
insdate: 2026-09-07 13:10:18
title: Telerik UI Padding-Oracle Bug Chained to Unauthenticated RCE — Public Exploit Released
additional: 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
category: Cybersecurity
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guid: https://thehackernews.com/2026/09/telerik-ui-padding-oracle-bug-chained.html
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