Beyond SMS OTP: How Technical Account Takeover Exploits Mobile Authentication Protocols
By
HackMoN Ai
Summary
This article examines the shift from traditional user-targeted fraud (SMS OTP interception, phishing) to a more sophisticated threat called Technical Account Takeover (Technical ATO). Unlike conventional attacks that trick users, Technical ATO exploits fundamental weaknesses in OAuth flows, session management, deep-link handling, passkey enrollment, and application logic. The article argues that as mobile authentication evolves toward OAuth, passkeys, and device-based trust, these protocol-level attacks bypass traditional fraud controls by targeting the underlying trust mechanisms rather than the user.
Source
bskyBeyond SMS OTP: How Technical Account Takeover Exploits Mobile Authentication Protocolsundercodetesting.comKey quotes
· 3 pulledThese attacks don't trick the user; they exploit fundamental weaknesses in OAuth flows, session management, deep-link handling, passkey enrollment, and application logic—bypassing traditional fraud controls by targeting the protocol and trust.
For years, security teams have focused on user-targeted fraud—SMS OTP interception, overlay attacks, and phishing—as the primary vectors for account takeover (ATO).
But as mobile authentication rapidly evolves toward OAuth, passkeys, and device-based trust, a more insidious threat has emerged: Technical ATO.
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