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

WWDC26 MR Live Coverage Article

WWDC 2026 Apple Event Live Keynote Coverage: iOS 27, Revamped Siri, and More

Monday June 8, 2026 9:15 am PDT by
Apple's Worldwide Developers Conference (WWDC) starts today with the traditional keynote kicking things off at 10:00 a.m. Pacific Time. MacRumors is on hand for the event and we'll be sharing details and our thoughts throughout the day. We're expecting to see a number of software-related announcements today, headlined by a reset on Apple's push into AI that should see a significant overhaul...
Aston Martin CarPlay Ultra Screen

Apple Says CarPlay Ultra is Coming to These Vehicle Brands

Thursday May 21, 2026 11:53 am PDT by
Last year, Apple launched CarPlay Ultra, the long-awaited next-generation version of its CarPlay software system for vehicles. Nearly a year later, CarPlay Ultra is still limited to Aston Martin's latest luxury vehicles, but that should change fairly soon. In May 2025, Apple said many other vehicle brands planned to offer CarPlay Ultra, including Hyundai, Kia, and Genesis. CarPlay Ultra...
ios 26 iphone 16 pro lock screen notifications feature 1

iOS 27 Notifications Will Slide in From Left Side of Your iPhone's Screen

Friday June 5, 2026 7:24 am PDT by
Bloomberg's Mark Gurman today revealed another iOS 27 change: notifications will slide in from the left side of the screen instead of from the top. In addition, accessing Notification Center on iOS 27 will require swiping down on the top-left corner of the screen. If you swipe down on the Dynamic Island area, a new "Search or Ask" interface tied to the revamped Siri will appear, instead of...

Top Rated Comments

156 months ago
Yo in hungarian means pointless app with dumb icon!
Score: 24 Votes (Like | Disagree)
156 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
156 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
156 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
156 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
156 months ago
1 million in angel funding? More like money laundering.
Score: 9 Votes (Like | Disagree)