Access Calendar Entries
An adversary could call standard operating system APIs from a malicious application to gather calendar entry data, or with escalated privileges could directly access files containing calendar data.
|Pegasus for Android|
On Android, accessing device calendar data requires that the app hold the READ_CALENDAR permission. Apps that request this permission could be closely scrutinized to ensure that the request is appropriate. On iOS, the app vetting process can determine whether apps access device calendar data, with extra scrutiny applied to any that do so.
On both Android (6.0 and up) and iOS, the user can view which applications have permission to access calendar information through the device settings screen, and the user can choose to revoke the permissions.