Telerik AJAX Unsafe Type Resolution Remote Code Execution

CVE-2026-13181 exploits unsafe type resolution in Progress Telerik UI for AJAX's AsyncUploadTypeName processing, where attackers forge upload metadata to trigger attacker-controlled type instantiation. This vulnerability enables unauthenticated remote code execution in versions prior to v2026.2.708, making it a critical threat to organizations deploying this widely-used AJAX framework. Any publicly-facing application using affected Telerik AJAX components becomes an immediate target, with exploitation requiring only the ability to craft malicious upload requests—no authentication necessary.

While this CVE lacks direct MITRE ATT&CK mapping, Casky's Claude-powered analysis would detect the underlying attack patterns associated with Execution (T1059) and Code Injection techniques by identifying anomalous type resolution chains and serialization gadget chains in network traffic and application logs. Practitioners using Casky would see findings highlighting suspicious AsyncUploadTypeName values deviating from expected type patterns, unusual .NET reflection activity, and deserialization of untrusted metadata structures—indicators that an attacker is attempting to instantiate arbitrary types for command execution. Extended reasoning across Casky's 754 mapped skills would correlate these signals with known exploitation patterns in component-based RCE attacks, enabling defenders to spot compromise attempts before successful code execution occurs.