CVE-2026-13186: Progress Telerik UI For ASP.NET AJAX

High severity, CVSS 8.1. EPSS: 0.7% chance of exploitation in the next 30 days.

In Progress® Telerik® UI for AJAX prior to v2026.2.708, a path traversal vulnerability in the file-based persistence storage provider can be exploited when the storage key is derived from user-controlled input, enabling attacker-controlled deserialization and remote code execution.

Affected products

• Progress Telerik UI For ASP.NET AJAX: from 2013.1.220, before 2026.2.708 (fixed in 2026.2.708)

Published 2026-07-22. Last modified 2026-08-06.