CVE-2026-13189 SpellChecker DictionaryLanguage Path Traversal Vulnerability in Telerik UI for ASP.NET AJAX

High 7.5 Published 22 Jul 2026 Updated 22 Jul 2026

Attackers can manipulate the language parameter to access unintended server files or trigger requests 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-2026-13189?

CVE-2026-13189 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, insufficient validation of the language parameter in the spell check handler may allow an attacker to influence server-side file path resolution and trigger unintended server-side requests.

Weakness: CWE-36

Which versions are affected by CVE-2026-13189?

It affects 1 product.

Products include Progress Telerik Ui for Asp.net Ajax.

How do I fix CVE-2026-13189?

No fix has been published for CVE-2026-13189 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-2026-13189 being exploited?

There is no known exploitation of CVE-2026-13189 in the wild and no public exploit code.

Sources

Also known as GHSA-hh76-q7vh-vv92.