What’s Vulnerable › Vulnerabilities

CVE-2026-13183: RadAsyncUpload Upload Metadata Timing Oracle Vulnerability in Telerik UI for ASP.NET AJAX

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-22 · updated 2026-10-24
• Weakness: CWE-208

Description

In Progress® Telerik® UI for AJAX prior to v2026.2.708, RadAsyncUpload upload metadata processing may leak cryptographic validity through measurable timing differences, enabling remote attackers to recover protected metadata values.

Affected products

• Progress Software Telerik UI for ASP.NET AJAX: from 2010.1309 before 2026.2.708 — fixed in 2026.2.708

How to fix

Upgrade to a fixed version: Progress Software Telerik UI for ASP.NET AJAX 2026.2.708. Check the vendor advisory for mitigations.

References

• https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-rau-timing-oracle-CVE-2026-13183

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