CVE-2026-13184

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Progress Telerik Ui For Asp.net Ajax

PublishedJul 22, 2026

First seenJul 22, 2026

Weakness typeCWE-321CWE-321

How to fix

Update

progress telerik_ui_for_asp.net_ajax2026.2.708 or later

Vendor advisories

telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rau-unauth-deserialization-chain-cve-2026-13184

Affected products

Product	Affected versions	Fixed in
progress telerik_ui_for_asp.net_ajax	2010.1309 ≤ v < 2026.2.708	2026.2.708

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