Access restriction settings for published calendars must be configured.

From Microsoft Outlook 2013 STIG

Part of DTOO219 - Access to Published Calendars

SV-53872r1_rule Access restriction settings for published calendars must be configured.

Vulnerability discussion

Users can share their calendars with others by publishing them to the Microsoft Office Online Calendar Sharing Services and to a server that supports the World Wide Web Distributed Authoring and Versioning (WebDAV) protocol. Office Online allows users to choose whether to restrict access to their calendars to people they invite, or allow unrestricted access to anyone who knows the URL to reach the calendar. DAV access restrictions can only be achieved through server and folder permissions, and might require the assistance of a server administrator to set up and maintain. If a calendar is visible to anyone on Office Online or third-party DAV servers, sensitive calendar information might be revealed.

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Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Outlook Options -> Preferences -> Calendar Options -> Office.com Sharing Service "Access to published calendars" to "Enabled".

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