Telerik UI for ASP.NET AJAX 2010.1.309 < 2026.2.708 Multiple RadAsyncUpload Vulnerabilities

high Nessus Plugin ID 351482

Synopsis

The remote host has a web application development framework that is affected by multiple vulnerabilities.

Description

The version of Progress Telerik UI for ASP.NET AJAX installed on the remote Windows host is 2010.1.309 or later and prior to 2026.2.708. It is, therefore, affected by multiple vulnerabilities:

- In Progress Telerik UI for AJAX prior to v2026.2.708, RadAsyncUpload client-state processing can distinguish decrypt failures from invalid-JSON parse failures, creating an oracle that reveals protected metadata values to remote attackers. (CVE-2026-13182)

- 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. (CVE-2026-13183)

- In Progress Telerik UI for AJAX prior to v2026.2.708, when Telerik.Upload.ConfigurationHashKey is absent and machineKey is not explicitly configured, upload metadata integrity protection may fall back to a predictable default key, enabling attackers to forge protected upload metadata and unlock further exploit chains.
(CVE-2026-13184)

Note that Nessus has not tested for these issues 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: High

ID: 351482

File Name: telerik_ui_for_aspnet_ajax_cve-2026-13181.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: Medium

Score: 4.9

Percentile: 58.18

CVSS v2

Risk Factor: High

Base Score: 7.8

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

CVSS Score Source: CVE-2026-13182

CVSS v3

Risk Factor: High

Base Score: 8.1

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

CVSS Score Source: CVE-2026-13181

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-2026-13181, CVE-2026-13182, CVE-2026-13183, CVE-2026-13184

IAVA: 2026-A-0763

Detections

Analytics