Quick answers
- Is CVE-2026-124701 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-124701 being exploited in the wild.
- How severe is CVE-2026-124701?
- High severity, with a CVSS score of 7.8, published 12 November 2026.
- Which products and versions are affected?
- Progress Telerik UI for WinForms prior to 2026.4.1111.
- Is there a fix for CVE-2026-124701?
- Yes: fixed in 2026.4.1111. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-124701 attacked?
- It is attacked over the network or with local access, in a software library.
- Am I affected by CVE-2026-124701?
- Check whether you run Progress Telerik UI for WinForms at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: 2026.4.1111
Technical details
A CWE-502 deserialization of untrusted data vulnerability exists in Telerik UI for WinForms prior to version 2026.4.1111. An attacker can craft malicious serialized objects that, when deserialized by the vulnerable component, execute arbitrary code or actions in the application's security context. The vulnerability likely requires the application to deserialize data from an untrusted source, such as user input or network traffic.
Affected products
- Progress Telerik UI for WinForms prior to 2026.4.1111
Timeline
- 2026-11-12: disclosed