CVE-2026-13183 RadAsyncUpload Upload Metadata Timing Oracle Vulnerability in Telerik UI for ASP.NET AJAX
Remote attackers can recover protected metadata values via timing differences in RadAsyncUpload, requiring an upgrade to Telerik UI for ASP.NET AJAX.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-13183?
CVE-2026-13183 is a high-severity vulnerability in Progress Software Telerik UI for ASP.NET AJAX, published on 22 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-208
Which versions are affected by CVE-2026-13183?
It affects 1 product.
Products include Progress Telerik Ui for Asp.net Ajax.
How do I fix CVE-2026-13183?
No fix has been published for CVE-2026-13183 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-13183 being exploited?
There is no known exploitation of CVE-2026-13183 in the wild and no public exploit code.
Other vulnerabilities in Progress Software Telerik UI for ASP.NET AJAX
- CVE-2017-11357 Telerik UI for ASP.NET AJAX Insecure Direct Object Reference
- CVE-2021-28141 Missing authorization in n/a
- CVE-2019-19790 Path traversal in n/a
- CVE-2026-13181 RadAsyncUpload AsyncUploadTypeName Type Resolution Vulnerability in Telerik UI for ASP.NET AJAX
- CVE-2026-13185 PersistenceFramework Cookie Deserialization Vulnerability in Telerik UI for ASP.NET AJAX
Sources
Also known as GHSA-c5xq-jjwj-x369.