CVE-2026-13188: Progress Telerik UI For ASP.NET AJAX

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may be tampered with, potentially altering dialog server-side behavior and enabling chained exploitation.

Affected products

• Progress Telerik UI For ASP.NET AJAX: from 2011.2712, before 2026.2.708 (fixed in 2026.2.708)

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