Forum Discussion
How to control only "Assigned To" can approve/reject a task ?
Using SharePoint 2013, permission of task list is user A and user B have Contribute permission. A task was "Assigned To" user A. How come user B can edit the task to approve/reject the task ? ...
Here is some good starting information for how to manage permissions using a SharePoint 2013 workflow and the REST API. You can use these actions to update permissions so that on change only the people who you either declare or are in the Assigned To have contribute, and everyone else you can grant read.
In this case i use the Plumsail Workflow Action Pack: https://plumsail.com/workflow-actions-pack/
It's very simple to use.