Do these 3 things before closing this tab:
1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsIn 2014, a flaw in GroupMe’s iOS registration flow reportedly let an attacker take over an account by knowing the phone number tied to it and guessing a four-digit SMS verification code. The problem was in the app’s verification process—not in iOS itself. GroupMe reportedly fixed it in iOS app version 5.0 on September 17, 2014.
How the GroupMe account takeover worked
During iOS registration, GroupMe asked for a name, email address, and password, then prompted the user to verify a phone number. The “different phone number” option reportedly let someone enter a number already linked to another person’s account.
GroupMe sent a four-digit code to that number and displayed a prompt to enter it. According to contemporaneous reporting, the app did not effectively limit repeated guesses or lock the process. A four-digit code has 10,000 possible combinations, making automated guessing practical in the reported flow. This figure describes the code space, not the number of accounts affected.
The prerequisite was knowledge of the target’s phone number and access to the app’s registration flow; the attack did not require the attacker to know the target’s existing password. SecurityWeek quoted researcher Dylan Saccomanni: “It was therefore trivial to automate this process and enter any user’s account knowing nothing but their phone number.” This quotation was reproduced by SecurityWeek in its October 31, 2014 report.
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What an attacker could change—and what remained
After successful verification, the attacker could replace the victim’s name, email address, and password with the details used during registration. SecurityWeek reported that those credential changes happened without confirmation or notification to the user.
The Register reported that the victim’s messages, groups, and account history remained, and that the phone number could not be changed. The result was described as a full-account takeover because the attacker could change key credentials and control access, even though the account’s existing content reportedly persisted.
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When the flaw was reported and fixed
| Event | Reported detail |
|---|---|
| Discovery and disclosure | Dylan Saccomanni discovered the flaw in late August 2014 and reported it to GroupMe on August 28, according to SecurityWeek and The Register. |
| Affected versions | The Register identified GroupMe iOS app version 4.4.4 and older as affected. |
| Reported fix | SecurityWeek said the fix shipped in iOS app version 5.0 on September 17, 2014; The Register reported the same update date. |
Both contemporaneous reports said there was no evidence of exploitation in the wild before the fix. That was the researcher’s reported assessment at the time; it cannot establish that no unobserved exploitation occurred.
Was this an iOS vulnerability?
No. The reports describe a defect in GroupMe’s iOS app registration and phone-verification flow. They do not describe a vulnerability in the iOS operating system. The distinction matters: the reported weakness was in how the app accepted and checked verification-code attempts, rather than in the phone’s operating system.
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How this differs from GroupMe’s 2024 vulnerabilities
A 2024 CERT-FR advisory covers different GroupMe privilege-escalation vulnerabilities, CVE-2024-38164 and CVE-2024-38176, and points to Microsoft security bulletins for their fixes: CERT-FR advisory CERTFR-2024-AVI-0607. Those later issues are separate from the 2014 SMS-verification account takeover. The 2014 reports do not establish the current security status of GroupMe or identify a current version affected by that old flaw.
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