CVE-2026-19219: DialogHandler UploadPaths Tampering Vulnerability in Telerik UI for ASP.NET AJAX

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-02 · updated 2026-09-08
Weakness: CWE-345

Description

In Progress® Telerik® UI for AJAX prior to v2026.3.812, insufficient integrity protection of dialog request parameters used by the RadEditor file browser may allow an attacker who has obtained certain application encryption key material to alter the folders the file browser reads from, writes to, and uploads into, potentially resulting in remote code execution.

Affected products

Progress Software Telerik UI for ASP.NET AJAX: from 2011.2.712 before 2026.3.812 — fixed in 2026.3.812

How to fix

Upgrade to a fixed version: Progress Software Telerik UI for ASP.NET AJAX 2026.3.812. Check the vendor advisory for mitigations.

References

https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-dialoghandler-uploadpaths-tampering-cve-2026-19219

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