CVE-2026-13188

MEDIUM 5.9

DialogHandler Parameters Tampering Vulnerability in Telerik UI for ASP.NET AJAX

CVSS Score

5.9

EPSS Score

0.0%

EPSS Percentile

0th

In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler request parameters may be tampered with, potentially altering dialog server-side behavior and enabling chained exploitation.

CWE	CWE-345
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:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Affected Versions

Progress Software / Telerik UI for ASP.NET AJAX

2011.2.712 < 2026.2.708

References

NVD ↗ CVE.org ↗ EPSS Data ↗

telerik.com: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-dialoghandler-parameters-tampering-CVE-2026-13188

Credits

Marcio Almeida of TantoSec