CVE-2026-14865

MEDIUM 5.3

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

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-776
Vendor	progress software
Product	telerik ui for asp.net ajax
Published	Jul 22, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Affected Versions

Progress Software / Telerik UI for ASP.NET AJAX

2009.1.314 < 2026.2.708

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Marcio Almeida of TantoSec