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V-277097

CAT II (Medium)

The macOS system must disable iCloud Mail.

Rule ID

SV-277097r1148743_rule

STIG

Apple macOS 26 (Tahoe) Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-000381

Discussion

The macOS built-in Mail.app connection to Apple's iCloud service must be disabled. Apple's iCloud service does not provide an organization with enough control over the storage and access of data and, therefore, automated mail synchronization must be controlled by an organization-approved service.

Check Content

Verify the macOS system is configured to disable iCloud Mail with the following command:

/usr/bin/osascript -l JavaScript << EOS
$.NSUserDefaults.alloc.initWithSuiteName('com.apple.applicationaccess')\
.objectForKey('allowCloudMail').js
EOS

If the result is not "false", this is a finding.

Fix Text

Configure the macOS system to disable iCloud Mail by installing the "com.apple.applicationaccess" configuration profile.