Blog | April 15th, 2024

The Risks of SMS-Based Two-Factor Authentication: Protecting Your Digital Security

The Risks of SMS-Based Two-Factor Authentication: Protecting Your Digital Security

In today’s increasingly digitized world, security breaches pose a significant threat to both businesses and individuals alike. As technology advances, so do the methods used by malicious actors to compromise sensitive information. One commonly used security measure, two-factor authentication (2FA), is intended to add an extra layer of protection. However, relying solely on SMS for 2FA comes with its own set of dangers and vulnerabilities.

SMS-based 2FA involves receiving a one-time passcode via text message to confirm your identity when logging into an account. While this method may seem convenient, it’s essential to recognize the inherent risks:

  • SMS Interception: SMS messages are not encrypted by default, making them susceptible to interception by hackers. By exploiting vulnerabilities in mobile networks or using sophisticated hacking techniques, attackers can intercept these messages and gain access to sensitive accounts.
  • SIM Swapping: Hackers can execute a SIM swapping attack by tricking a mobile carrier into transferring a victim’s phone number to a SIM card under their control. Once they have control of the phone number, they can intercept SMS-based 2FA codes and hijack accounts.
  • Phishing Attacks: Cybercriminals often use phishing tactics to trick individuals into divulging their login credentials or providing access to their devices. With SMS-based 2FA, attackers can use phishing messages to convince users to input their 2FA codes, thereby bypassing the intended security measures.
  • Device Theft or Loss: If a device containing sensitive accounts is lost or stolen, the SMS-based 2FA method becomes ineffective. Without additional security measures in place, such as device encryption or biometric authentication, unauthorized individuals can easily access accounts by intercepting SMS codes.
  • Dependence on Mobile Networks: SMS-based 2FA relies on the availability and reliability of mobile networks. In the event of network outages or disruptions, users may be unable to receive 2FA codes, resulting in difficulty accessing their accounts when needed most.
  • Account Takeover via Phone Provider Login: Another risk associated with SMS-based 2FA is the potential for attackers to gain access to a user’s phone provider account. By compromising the credentials used to manage phone services, hackers can redirect SMS messages, intercepting 2FA codes and effectively take over the victim’s accounts.

The consequences of unauthorized access to accounts via intercepted 2FA codes can be severe.

Attackers can:

  • Gain access to emails, compromising sensitive communications and potentially accessing other online accounts linked to the email address.
  • Compromise bank accounts, enabling unauthorized transactions and financial theft.
  • Change wire instructions, diverting funds to attacker-controlled accounts.
  • Alter invoices, leading to fraudulent payments or unauthorized changes to financial records.
  • Create forwarders or filters in email accounts, intercepting sensitive information or diverting communications.

To mitigate these risks and safeguard against potential security breaches, businesses and individuals should consider alternative methods of two-factor authentication. Solutions such as authenticator apps (Microsoft Authenticator and Google Authenticator), hardware tokens, or biometric authentication offer enhanced security and reduce the likelihood of unauthorized access. 

At Contango, we specialize in providing comprehensive security consultations to help businesses and individuals assess their current security measures and implement robust strategies to protect against cyber threats. Our team of experts can offer tailored recommendations and guidance to strengthen your digital security posture and minimize the risks associated with SMS-based 2FA.

In conclusion, while SMS-based two-factor authentication may offer a level of convenience, it also introduces significant security vulnerabilities. By understanding these risks and adopting alternative authentication methods, businesses and individuals can better protect themselves against cyber threats and safeguard their sensitive information.For more information on how Contango can help secure your digital assets, please visit or contact us directly at

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