In Lightning Experience, users may notice that Edit and Delete options are available in the Campaign History related list on Lead or Contact records—even when they have read-only access to those objects.
Steps to Reproduce:
This behavior is expected and works as designed.
Users have the ability to edit or delete a Campaign Member record under Campaign History in Lightning Experience due to the following permissions assigned to their user account:
To edit/delete a Contact Campaign Member record:
To edit/delete a Lead Campaign Member record:
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