Telerik UI for ASP.NET AJAX 2009.1.314 < 2026.2.708 LayoutBuilder XXE DoS

medium Nessus Plugin ID 351480

Synopsis

The remote host has a web application development framework that is affected by a denial of service vulnerability.

Description

The version of Progress Telerik UI for ASP.NET AJAX installed on the remote Windows host is 2009.1.314 or later and prior to 2026.2.708. It is, therefore, affected by a denial of service vulnerability. The internal LayoutBuilder control processes client-state XML without disabling DTD processing, allowing unauthenticated denial of service via recursive XML entity expansion.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Progress Telerik UI for ASP.NET AJAX version 2026.2.708 (2026 Q2 SP1) or later.

Plugin Details

Severity: Medium

ID: 351480

File Name: telerik_ui_for_aspnet_ajax_cve-2026-14865.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 9/30/2026

Updated: 9/30/2026

Configuration: Enable paranoid mode, Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-14865

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vulnerability Information

CPE: cpe:/a:telerik:ui_for_asp.net_ajax

Required KB Items: Settings/ParanoidReport, installed_sw/Telerik UI for ASP.NET AJAX

Patch Publication Date: 7/22/2026

Vulnerability Publication Date: 7/22/2026

Reference Information

CVE: CVE-2026-14865

Detections

Analytics