Credential Theft: How Stolen Logins Fuel Major Cybersecurity Breaches Stolen credentials remain one of the most common entry points for cyberattacks, enabling threat actors to bypass security controls by impersonating legitimate users. Unlike traditional breaches that exploit software vulnerabilities, these attacks rely on phishing, password reuse, or previously leaked credentials to gain unauthorized access often without triggering alarms. Phishing remains a primary method, tricking users into entering login details on fake websites. Credential stuffing where attackers use automated tools to test stolen usernames and passwords across multiple services also plays a significant role, particularly when users reuse passwords. Compromised third-party vendors can further expose credentials, providing attackers with direct access to internal systems. A high-profile breach at a major consumer genetics platform demonstrated the escalating risks of credential-based attacks. Attackers used credentials from prior data breaches to log into user accounts. Once inside, they exploited platform features that linked user data, ultimately exposing sensitive genetic and personal information tied to millions of individuals. The incident led to lawsuits, regulatory scrutiny, and forced the company to implement stronger authentication measures all without a single software vulnerability being exploited. Traditional security models that rely solely on passwords are increasingly inadequate, as credentials are among the easiest security elements for attackers to steal. Modern access security adopts a Zero Trust approach, verifying not just passwords but also device trust, security posture (e.g., patch status, encryption), and contextual signals (e.g., login location, time). By requiring multiple layers of validation, organizations can prevent stolen credentials from leading to full-scale breaches. Many breaches occur because security measures are reactive rather than proactive. The cost of responding to an incident including forensic investigations, regulatory fines, and reputational damage often far exceeds the investment needed to implement stronger access controls upfront. A proactive security strategy assumes credentials will be compromised and focuses on limiting what attackers can do with them, ensuring that even stolen logins do not automatically grant access to critical systems.

The Maine Office of the Attorney General reported a data breach involving Consumer Reports on September 28, 2023, which occurred on May 29, 2023. The incident involved unauthorized access to Pension Benefit Information, LLC’s MOVEit Transfer software, affecting 560 individuals, including social security numbers that were compromised. Notification letters to affected individuals were expected to be provided starting August 18, 2023.