We have Request Workflow in place with automatic assignment using action macros. So far we are good, however we observe there is no security check or validation for the workflow updates. Any one can update any Request workflow regardless of the assignment status. I believe there must be an OOTB option (may be under options manager) to impose a security on Request workflow so that only assignee of the workflow can update the task.
Could someone help me to direct towards the option to impose the security.