CVE-2026-124700 URL Redirection to Untrusted Site in Progress Telerik UI for WinForms
Crafted documents or hyperlinks can launch arbitrary OS protocol handlers via unallowlisted URI schemes in Telerik UI for WinForms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-124700?
CVE-2026-124700 is a high-severity open redirect vulnerability in Progress Software Telerik UI for WinForms, published on 12 Nov 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In Telerik UI for WinForms, versions prior to 2026.4.1111, an untrusted URL redirection vulnerability exists that allows an attacker to launch arbitrary operating system protocol handlers with attacker-controlled arguments via crafted documents and hyperlinks with a non-allowlisted URI scheme that the user opens.
Weakness: CWE-601
Which versions are affected by CVE-2026-124700?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-124700?
No fix has been published for CVE-2026-124700 yet. Limit exposure of the affected software until one is available.
Upgrade, and only redirect to addresses on an allow-list. More about Open redirect.
Is CVE-2026-124700 being exploited?
There is no known exploitation of CVE-2026-124700 in the wild and no public exploit code.
Sources
Also known as GHSA-mj6m-6q3p-686m.