CVE-2026-14865 PUBLISHED

XXE Denial of Service via RadLayoutBuilder Client State in Telerik UI for ASP.NET AJAX

Assigner: ProgressSoftware
Reserved: 06.07.2026 Published: 22.07.2026 Updated: 22.07.2026

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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS Score: 5.3

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	Low

CVSS 3.1

Product Status

Vendor	Progress Software
Product	Telerik UI for ASP.NET AJAX
Versions	Default: unaffected affected from 2009.1.314 to 2026.2.708 (excl.)

Credits

Marcio Almeida of TantoSec finder

References

https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rlb-xxe-injection-client-state-cve-2026-14865

Problem Types

CWE-776 Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion') CWE

Impacts

CAPEC-197 Exponential Data Expansion