Messaging app Yo, which in the past week has rocketed to the top of the app download charts, has been hit by a hack.
Creator Or Arbel told technology news site TechCrunch the app was having "security issues".
The app allows users to send a message saying "yo" to friends - and nothing else.
It has been branded "pointless", but has nonetheless raised $1m (£600,000) in investment.
TechCrunch said it was contacted by three college students who said they had uncovered a flaw in the app.
"We can get any Yo user's phone number (I actually texted the founder, and he called me back)," the students told TechCrunch.
"We can spoof yos from any users, and we can spam any user... We could also send any Yo user a push notification with any text we want (though we decided not to do that)."
Other developers have been able to recreate the flaw.
Similar problems have hit apps such as Snapchat and Tinder in the past few months.
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