CVE-2026-13182

HIGH 7.5

RadAsyncUpload Client-State Decrypt-vs-Parse Oracle Vulnerability in Telerik UI for ASP.NET AJAX

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

In Progress® Telerik® UI for AJAX prior to v2026.2.708, RadAsyncUpload client-state processing can distinguish decrypt failures from invalid-JSON parse failures, creating an oracle that reveals protected metadata values to remote attackers.

CWE	CWE-209
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:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

Progress Software / Telerik UI for ASP.NET AJAX

2010.1.309 < 2026.2.708

References

NVD ↗ CVE.org ↗ EPSS Data ↗

telerik.com: https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rau-padding-oracle-cve-2026-13182

Credits

Marcio Almeida of TantoSec