Vulnerability · Published Jul 22, 2026 · Assigned by ProgressSoftware
CVE-2026-14865XXE Denial of Service via RadLayoutBuilder Client State in Telerik UI for ASP.NET AJAX
Medium 5.3
In plain English
A medium-severity security flaw in Telerik UI for ASP.NET AJAX from Progress Software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).
Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.4%top 62.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
In Progress® Telerik® UI for AJAX prior to v2026.2.708, the internal LayoutBuilder control processes client-state XML without disabling DTD processing, allowing unauthenticated denial of service via recursive XML entity expansion.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Progress Software | Telerik UI for ASP.NET AJAX | 2009.1.314 – before 2026.2.708 |
Weakness: CWE-776 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L