https://www.theregister.co.uk/2019/12/03/yodel_tracking_app_security_flaw/

Parcel wrangler Yodel has corked up a security hole in which random user data leaked to people using its Android app.

The glitch was spotted by security researcher Ax Sharma. He contacted us having failed to get any action out of Yodel when he informed the company via Twitter and web chat.