QUESTION
What permissions are required to terminate a workflow using the "terminate workflow" link?ANSWER
This option is controlled by SharePoint and SharePoint requires the “Manage Lists” permission to terminate a workflow.ADDITIONAL INFORMATION
Out-of-the-box, the “Design” group has the Manage Lists permission.The same behavior applies to the 'terminate workflow' link on the SharePoint workflow status page (accessible from item drop down menu -> workflows).