Yo is an app that lets you send the word “Yo!” to your friends. The app has been hacked. Developers discovered a security flaw that reveals the phone numbers of its users. The vulnerability involved the way the app sends messages to its users and takes advantage of an infrastructure issue that leaves the database open to anyone capable of sending a request for the information.
Developers concerned over how easy it was to access user information went on Twitter to discuss the issue with the hashtag: #YoBeenHacked. Developers used the vulnerability of the app to send out an announcement and warn of security flaws. It is recommended that you delete the app until a full fix and update has been added.
The app has your list of contacts. You can tap one of those contacts and send a notification that simply says “Yo” along with with an audio alert of the word that is said. The Yo! app raised $1 million in angel funding from a group of investors led by Mobli CEO Moshe Hogeg.
Hogeg asked Yo founder Or Arbel to design a single-button app that he could use to call his assistant without having to pick up the phone.