CVE-2026-124701 Deserialization of Untrusted Data in Progress Telerik UI for WinForms
Attackers can exploit unsafe deserialization in Telerik UI for WinForms to perform unauthorized actions in affected applications.
- 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-2026-124701?
CVE-2026-124701 is a high-severity unsafe deserialization 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, a deserialization of untrusted data vulnerability exists that allows an attacker to perform unauthorized actions in the context of the affected application.
Weakness: CWE-502
Which versions are affected by CVE-2026-124701?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-124701?
No fix has been published for CVE-2026-124701 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-124701 being exploited?
There is no known exploitation of CVE-2026-124701 in the wild and no public exploit code.
Sources
Also known as GHSA-2gpg-hj59-w97r.