DialogHandler Provider Type Tampering Vulnerability in Telerik UI for ASP.NET AJAX

published 2026-07-22 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-47692

cvss: 8.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

In Progress® Telerik® UI for AJAX prior to v2026.2.708, DialogHandler provider type input may be tampered with, potentially altering dialog processing and enabling chained exploitation.

Patch / fix

fixed in 1

Progress Software Telerik UI for ASP.NET AJAX 2026.2.708

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 3 mo ago (2026-07-23)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Progress Software Telerik UI for ASP.NET AJAX

Classification

Weakness

CWE-470 Use of Externally-Controlled Input to Select Classes or Code

References

telerik.com /products/aspnet-ajax/documentation/knowledge-base/kb-security-dialoghandler-provider-type-tampering-CVE-2026-
vendor-advisory, mitigation

Sources

CVE List CVE-2026-13187
NVD CVE-2026-13187

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary