Authentication Links: A Security Threat to Privacy

Wednesday, 21 January 2026, 23:22

Authentication links are compromising privacy and security. Recent research reveals that millions of users are at risk due to SMS messages containing sign-in links. These vulnerabilities in widely-used platforms expose sensitive data to scams and identity theft.
Arstechnica
Authentication Links: A Security Threat to Privacy

Significant Risks of Authentication Links

Authentication links are causing serious privacy and security concerns. Popular services that send sign-in links via SMS messages are putting millions at risk.

Vulnerability Overview

Researchers have discovered that over 700 endpoints utilize SMS to deliver these authentication texts, affecting more than 175 different services. This practice heightens the chances of identity theft and scams.

  • Users often forgo traditional usernames and passwords.
  • Cell phone numbers become the key to creating accounts.
  • Authentication links can be easily exploited by scammers.

Scammers Exploiting Weaknesses

One alarming tactic used by scammers involves enumerating authentication links. By modifying the security token in the URL, scammers can rapidly gain access to other users’ accounts.

  1. Increment the security token.
  2. Access personal details like insurance applications.
  3. Perpetuate fraud and scams.

This research underscores the urgent need for stronger security measures in services relying on SMS-based authentication links. Without improvements, user privacy will remain at stake.


This article was prepared using information from open sources in accordance with the principles of Ethical Policy. The editorial team is not responsible for absolute accuracy, as it relies on data from the sources referenced.


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