Pocket through 8.33.0.0 allows XSS because "Save to Pocket" injects external HTML into the DOM. JavaScript code can alter the application state via native bridge methods.
User must have saved at least one article to Pocket prior to attack.
The DownloadingService must be running in background (default behavior on BOOT_COMPLETED).
No special configuration required; default installation is vulnerable.
Immediately uninstall com.ideashower.readitlater.pro from all Android devices.
Revoke Google OAuth grants associated with the Pocket account.
No vendor-provided mitigation or patch is available. Product is End-of-Life.
The only mitigation is uninstallation of the application.