CVE-2026-13186 AppDataStorageProvider Path Traversal Deserialization Vulnerability in Telerik UI for ASP.NET AJAX

High 8.1 Published 22 Jul 2026 Updated 24 Jul 2026

Attackers can exploit path traversal in file-based storage to trigger deserialization and achieve remote code execution in 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-2026-13186?

CVE-2026-13186 is a high-severity path traversal 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, a path traversal vulnerability in the file-based persistence storage provider can be exploited when the storage key is derived from user-controlled input, enabling attacker-controlled deserialization and remote code execution.

Weakness: CWE-22

Which versions are affected by CVE-2026-13186?

It affects 1 product.

Products include Progress Telerik Ui for Asp.net Ajax.

How do I fix CVE-2026-13186?

No fix has been published for CVE-2026-13186 yet. Limit exposure of the affected software until one is available.

Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.

Is CVE-2026-13186 being exploited?

There is no known exploitation of CVE-2026-13186 in the wild and no public exploit code.

Sources

Also known as GHSA-jxcm-j98v-7cfr.