When using the Group Custom Field Value on the "Create Issue" project permission, any user in JIRA is able to create issues on the project.

Steps to reproduce:

• Create a Group Picker custom field (Global Context) (Administration> Issue Fields > Custom Fields) - let's say Test Group Picket Custom Field
  • OPTIONAL Set a default value for the custom field
• Go to the Default permission scheme and Add to the "Create Issue" Permission the option Group Custom Field Value
• Go to the Default permission scheme and Add to the "Create Issue" Permission the option Group and choose group jira-administrators
• Create a user and add it only to the jira-users group.
• Create a project and associate it to the Default permission scheme
• Log in JIRA with the user you just created
• The user will be able to create issues on the project you just created project.

• • If you remove the Group Custom Field Value from the "Create Issue" permission, the user is no longer able to create issues on the project.