---
id: "CVE-2026-124699"
page: "https://infrastack.ai/live/CVE-2026-124699"
kind: "vulnerability"
aliases: ["CVE-2026-124699"]
title: "Telerik UI for WinForms: crafted expression runs unauthorized code in apps"
severity: "high"
cvss: 7.8
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["dotnet", "package", "telerik", "windows", "winforms"]
not_affected_if: ["version-2026.4.1111-or-later"]
published_at: "2026-11-12T10:17:28+00:00"
first_seen_at: "2026-11-12T10:37:45+00:00"
updated_at: "2026-11-12T10:39:39+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124699", "first_seen_at": "2026-11-12T10:37:45+00:00"}]
exploit_sources: []
---

# Telerik UI for WinForms: crafted expression runs unauthorized code in apps

Link for people: https://infrastack.ai/live/CVE-2026-124699 (this .md is for agents)

Telerik UI for WinForms, a component library for Windows desktop apps, fails to control code generation from expressions. An attacker who supplies a crafted expression can run unauthorized code inside the affected application.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Telerik.UI.for.WinForms version referenced in your project files (for example in `packages.config` or the `.csproj` package references).
- Confirm whether the version is earlier than `2026.4.1111`.

## Fix

- Telerik UI for WinForms: move to `2026.4.1111` or later.

## Timeline

- 2026-11-12T10:37:45+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124699

## From the sources

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.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_