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

published 2026-09-02 2 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-69898

cvss: 8.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 14%
public exploits: 0; none known

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.

Patch / fix

fixed in 1

Progress Software Telerik UI for ASP.NET AJAX 2026.3.812

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 mo ago (2026-09-02)

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 14% 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-345 Insufficient Verification of Data Authenticity
CWE-434 Unrestricted Upload of File with Dangerous Type

References

telerik.com /products/aspnet-ajax/documentation/knowledge-base/kb-security-dialoghandler-uploadpaths-tampering-cve-2026-19
vendor-advisory

Sources

CVE List CVE-2026-19219
NVD CVE-2026-19219

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