CVE-2026-13183: Progress Telerik UI For ASP.NET AJAX

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

In Progress® Telerik® UI for AJAX prior to v2026.2.708, RadAsyncUpload upload metadata processing may leak cryptographic validity through measurable timing differences, enabling remote attackers to recover protected metadata values.

Affected products

• Progress Telerik UI For ASP.NET AJAX: from 2010.1309, before 2026.2.708 (fixed in 2026.2.708)

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