Simplistic 'Yo' Messaging App Soars in App Store Charts, Proves Vulnerable to Hacking - MacRumors
Skip to Content

Simplistic 'Yo' Messaging App Soars in App Store Charts, Proves Vulnerable to Hacking

The Yo messaging app [Direct Link] debuted earlier this year and recently rocketed up the iOS App Store charts, where it currently sits at number five among top free iPhone apps in the United States. The simplistic app that does nothing more than allow users to ping contacts with a simple "Yo" message may be gaining traction with its quirky ease of use, but a hack, confirmed by Yo founders to TechCrunch, may put users' personal information at risk.

yo-app-screens
According to the TechCrunch report, a student at Georgia Tech discovered a flaw that allows a nefarious user to discover the phone number of another Yo user, spoof a message from any Yo member and send a text-based push notification to recipient devices. Yo founder Or Arbel confirmed to TechCrunch the service was having "security issues," but did not provide details on the vulnerability, only stating that the issues will be resolved soon.

Founder Or Arbel has now confirmed that Yo was “having security issues”.

He told TechCrunch: “Some of the stuff has been fixed and some we are still working on. We are taking this very seriously.”

He said he could not reveal which hacks were still live. He said the company has brought in a specialist security team to deal with the issues

Arbel said he hoped the security problems would be fixed “in next few hours.”

According to Valleywag, the idea for Yo came from Israeli investor and Mobli CEO Moshe Hogeg, who wanted an easy way to communicate with his secretary. Developer Or Arbel ran with the idea and created the Yo app, which Hogeg uses. Life Before Us LLC, the company created by Abel, recently received $1 million in angel funding to continue development of the Yo app.

Popular Stories

iphone 16 teal

'Siri AI' Lawsuit Update: Apple to Pay Owners of These iPhone Models

Thursday July 9, 2026 7:08 am PDT by
In May, Apple agreed to pay $250 million to settle a U.S. class action lawsuit over Siri AI's delayed launch, and eligible iPhone users could receive up to a $95 payout. This week, the California court overseeing the case held a hearing regarding preliminary approval of the settlement, but the judge has not yet issued a ruling. It will likely be at least a few more months before eligible...
Apple TV Thumb 3

Everything Coming in the 2026 Apple TV 4K

Wednesday July 8, 2026 4:51 pm PDT by
The Apple TV 4K hasn't been updated since 2022, and it's due for a refresh. An update is planned for 2026, but Apple is likely going to wait to launch it after Siri AI launches in iOS 27. Design Apple TV design updates don't happen often, and that's not changing. The next Apple TV is going to have the same squircle shape as the current model, and it'll continue to be made from a black...
apple wallet drivers license feature iPhone 15 pro

Apple Says iPhone Driver's Licenses Will Expand to These 6 U.S. States

Thursday July 9, 2026 7:29 am PDT by
In select U.S. states, residents can add their driver's license or state ID to the Apple Wallet app on the iPhone and Apple Watch, and then use it to display proof of identity or age at select airports and businesses, and in select apps. To set up the feature, open the Wallet app on the iPhone and tap on the plus sign in the top-right corner. Next, tap on Driver's License and ID Cards,...

Top Rated Comments

157 months ago
Yo in hungarian means pointless app with dumb icon!
Score: 24 Votes (Like | Disagree)
157 months ago
This could be the start of something big.

SO finally users are so dumb they need a special app for each message they send. I think I will make a "What's up?" app and then a few other apps for sending various replies. I can have an entire ecosystem of message apps: "yo", What's Up", "Hey", "duh" and 50 or 100 others. My new message apps will fill the first 10 screens on the home page.

Do I need to translate these to other languages?

This might work even better in Chinese. I can make a huge pile of "one charter apps."
Score: 16 Votes (Like | Disagree)
iSee Avatar
157 months ago
So now nefarious hackers can make it seem like you said "Yo" to someone you totally didn't say "Yo" to!

Good god, imagine the disruption! Teen social pecking-orders could be overturned all over the world! Is there no end to the depredations hacker wreak upon us?
Score: 13 Votes (Like | Disagree)
pauliaK Avatar
157 months ago
Why would you ever need this? Some of the stuff and it's popularity is beyond me.
Score: 10 Votes (Like | Disagree)
AstronomyiPhone Avatar
157 months ago
So you help it soar further by writing a story about it and providing a [Direct Link]?
Score: 10 Votes (Like | Disagree)
miknos Avatar
157 months ago
1 million in angel funding? More like money laundering.
Score: 9 Votes (Like | Disagree)