What is CVE-2026-13189?

CVE-2026-13189 is a high-severity vulnerability in Progress Telerik Ui For Asp.net Ajax, classified under Absolute Path Traversal. CVSS score: 7.5/10. Published 2026-07-22.

How severe is CVE-2026-13189?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Progress Telerik Ui For Asp.net Ajax

CVE-2026-13189

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.

Published 2026-07-22 · last modified 2026-10-24.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (28.7th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 28.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.004 · change: -0.002

Affected products

Progress Telerik Ui For Asp.net Ajax
Progress Software Telerik Ui For Asp.net Ajax — versions 2011.2.712

Weakness classification (CWE)

CWE-36 — Absolute Path Traversal

References

www.telerik.com/products/aspnet-ajax/documentation/knowledge-base/kb-security-s… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2026-13189?: CVE-2026-13189 is a high-severity vulnerability in Progress Telerik Ui For Asp.net Ajax, classified under Absolute Path Traversal. CVSS score: 7.5/10. Published 2026-07-22.
How severe is CVE-2026-13189?: High severity. CVSS v3 base score is 7.5 out of 10.