# Improper Control of Generation of Code Vulnerability (CVE-2026-124699)

## Description

November 2026 - [CVE-2026-124699](https://www.cve.org/CVERecord?id=CVE-2026-124699)

* Telerik UI for WinForms 2026 Q3 2026.3.1007 or earlier.

### What Are the Impacts

In Telerik UI for WinForms, versions prior to 2026.4.1111, an improper control of code generation vulnerability exists that allows an attacker to supply a crafted expression and execute unauthorized code in the context of the affected application.

## Issue

* CWE-94: Improper Control of Generation of Code
* CAPEC-242: Code Injection

## Solution

We have addressed the issue and the Progress Telerik team strongly recommends performing an upgrade to the latest version listed in the table below.

| Current Version            | Update to        |
| -------------------------- | ---------------- |
| `>= 0` && `<= 2026.3.1007` | `>= 2026.4.1111` |

Follow the [update instructions](https://www.telerik.com/products/winforms/documentation/installation-and-upgrades/upgrade-project) for precise instructions. All customers who have a license for Telerik UI for WinForms can access their downloads here [Product Downloads | Your Account](https://www.telerik.com/account/downloads/product-download).

## Notes

* If you have any questions or concerns related to this issue, open a new Technical Support case in [Your Account | Support Center](https://www.telerik.com/account/support-center/contact-us/). Technical Support is available to customers with an active support plan.

## External References

[CVE-2026-124699](https://www.cve.org/CVERecord?id=CVE-2026-124699) (High)

**CVSS:** 7.8

In Telerik UI for WinForms, versions prior to 2026.4.1111, an improper control of code generation vulnerability exists that allows an attacker to supply a crafted expression and execute unauthorized code in the context of the affected application.