Is CVE-2026-13189 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-13189 being exploited in the wild.

How severe is CVE-2026-13189?

High severity, with a CVSS score of 7.5, published 22 July 2026.

Which products and versions are affected?

Progress Software UI for ASP.NET AJAX >= 2011.2.712, <= 2026.2.519.

Is there a fix for CVE-2026-13189?

A patch was published on 2026-07-22. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-13189 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-13189?

Check whether you run Progress Software UI for ASP.NET AJAX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-13189: Progress Telerik UI for ASP.NET AJAX path traversal in spell check handler

Q: Is there a fix for CVE-2026-13189?

A patch was published on 2026-07-22. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-13189 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-13189?

Check whether you run Progress Software UI for ASP.NET AJAX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-13189 · Severity: high · CVSS 7.5 · Published 2026-07-22

A vulnerability exists in the Telerik UI for ASP.NET AJAX library, a popular suite of components used to build web applications. The flaw is located in the spell-checking feature, where improper handling of user input could allow an attacker to access sensitive files on the server or trigger unauthorized network requests. This could lead to the exposure of confidential data or provide a foothold for further attacks on the internal network.

Technologies: Progress Software UI for ASP.NET AJAX. Vendors: Progress Software.

Quick answers

Is CVE-2026-13189 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-13189 being exploited in the wild.
How severe is CVE-2026-13189?: High severity, with a CVSS score of 7.5, published 22 July 2026.
Which products and versions are affected?: Progress Software UI for ASP.NET AJAX >= 2011.2.712, <= 2026.2.519.
Is there a fix for CVE-2026-13189?: A patch was published on 2026-07-22. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-13189 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-13189?: Check whether you run Progress Software UI for ASP.NET AJAX at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A path traversal vulnerability (CWE-36) exists in the RadSpell component of Progress Telerik UI for ASP.NET AJAX. The spell check handler fails to properly validate the 'language' parameter provided in HTTP requests. An unauthenticated remote attacker can exploit this by supplying manipulated file paths, allowing them to influence server-side file resolution. This can lead to unauthorized reading of local files or the triggering of unintended server-side network requests (SSRF). The issue is resolved in version 2026.2.708 (2026 Q2 SP1) and later.

Affected products

Progress Software Telerik UI for ASP.NET AJAX >= 2011.2.712, <= 2026.2.519

Timeline

2026-07-22: disclosed
2026-07-22: advisory
2026-07-22: patched

References

https://www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-spellchecker-dictionarylanguage-path-traversal-CVE-2026-13189

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