"Push notifications can contain a significant amount of information about you, your communications, and what you do throughout the day. They're important enough to government investigations that Apple and Google now both require a judge's order to hand details about push notifications over to law enforcement."
"According to a letter sent to the Department of Justice by Senator Wyden, the content of those notifications may be visible to Apple and Google, and at the very least the companies collect some metadata about what apps send a notification and when."
"Once the notifications land on your phone, depending on your settings, the notification content may be visible on your lock screen without needing to unlock the device. This can be dangerous if you lose your device, someone steals it, or it's confiscated by law enforcement."
"Notification content may even persist after the app is deleted, if the content notifications get recorded in your device's internal storage, which then makes them susceptible to recovery with certain types of forensic tools."
Push notifications can expose personal information and communications. Apple and Google require a judge's order to share notification details with law enforcement. Notifications are routed through their servers, making content visible to these companies. App developers can choose to hide notification content, as seen with Signal. Once on a device, notifications may appear on the lock screen, posing privacy risks if the device is lost or stolen. Deleted notifications can still be recovered through forensic tools, raising further privacy concerns.
Read at Electronic Frontier Foundation
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