Good morning, after an upgrade to DNN version 9.12 and then trying to do a Telerik removal, i got a message that says:

is this a problem ? it's recommended to remove telerik for security purposes.

We have detected the presence of the previously distributed Telerik developer components. Detected Telerik version is: 2013.2.717.40
A Security Bulletin was released in August of 2021 that recommends immediate removal of this component due to the high-level security vulnerabilities present. You can read more about this on the DNN Security Center.
Your installation is utilizing Telerik in the following assemblies:
Mandeeps.DNN.Library.Workflow.dll
However, please ensure that you have in fact properly patched Telerik and removed all DNN Platform distributed Telerik components per the guidance found here. Note you will NOT be able to upgrade to DNN 10 with those dependencies unless they are distributed with their own copy of Telerik.