HI @BhagyaK58374570 

ACLs (Access Control Lists) are the primary mechanism to control table-level and field-level access in ServiceNow. You can create or modify ACLs to explicitly deny write access for the Guest user.

You can create a new ACL or edit an existing one for the wm_task table. 

I hope my answer helps you to resolve your issue, if yes please mark my answer helpful and correct.

thank you

Rajesh