Learning from the Past: Top 10 Data Breaches in the Last 10 Years and How Mjolnir Security Can Help

News + Digital Forensics + Incident Response Mjolnir Security todayMarch 27, 2023 89

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Cybersecurity has never been more critical in our increasingly digital world. As technology advances, cybercriminals are finding new ways to exploit vulnerabilities and access sensitive information. In the past five years, we’ve witnessed some of the most significant and damaging data breaches in history. By examining these incidents, we can learn valuable lessons about protecting ourselves from cyber threats.

In this thought leadership article, we will explore the top 10 data breaches from the last five years and how they occurred. We will also discuss the role Mjolnir Security’s Digital Forensics and Incident Response services can play in helping businesses stay ahead of cybersecurity threats.

Top 10 Data Breaches in the Last 5 Years

  1. Yahoo (2016): 3 billion user accounts were compromised, making it the largest breach in history. The breach was due to unauthorized access to user account data, including names, email addresses, and hashed passwords.
  2. Equifax (2017): 147 million individuals’ sensitive information was exposed, including social security numbers and credit card data. This breach was caused by a failure to patch a known vulnerability in their software.
  3. Marriott International (2018): Hackers accessed the reservation database of Starwood properties, compromising 500 million guest records. The breach was due to insufficient security measures, and the attackers gained access to sensitive data such as names, addresses, and passport numbers.
  4. Facebook (2019): 540 million user records were exposed due to unprotected Amazon Web Services (AWS) storage. The breach occurred because of third-party app developers’ failure to secure their databases.
  5. Capital One (2019): A hacker accessed the personal information of over 100 million customers and applicants in the United States and 6 million in Canada. The breach was caused by a misconfigured web application firewall, allowing unauthorized access to the data.
  6. MGM Resorts (2020): 142 million guest records were exposed, including names, addresses, and contact information. The breach was attributed to unauthorized access to a cloud server.
  7. SolarWinds (2020): The SolarWinds supply chain attack affected numerous organizations, including government agencies and private companies. The attackers infiltrated systems by compromising a software update, leading to the exposure of sensitive information and system disruptions.
  8. Microsoft Exchange (2021): A vulnerability in the Microsoft Exchange Server allowed hackers to access email accounts and install malware. The attack affected over 250,000 organizations worldwide, leading to data theft and potential espionage.
  9. LinkedIn (2021): 700 million user records were exposed due to data scraping techniques. Although not a traditional data breach, the incident demonstrated the potential risks associated with publicly accessible data and the importance of securing user information.
  10. T-Mobile (2021): Personal data of over 50 million customers was compromised, including names, addresses, social security numbers, and driver’s license information. The breach was caused by the exploitation of a misconfigured server.

How Mjolnir Security’s Digital Forensics and Incident Response Services Can Help

To prevent data breaches and minimize damage when incidents occur, organizations must adopt a proactive approach to cybersecurity. Mjolnir Security’s Digital Forensics and Incident Response (DFIR) services provide comprehensive solutions for businesses looking to strengthen their security posture:

  1. Proactive Threat Hunting: Mjolnir Security’s team of experts constantly monitor and analyze networks for signs of intrusion or abnormal behavior. This proactive approach enables organizations to detect and address threats before they escalate.
  2. Incident Response Planning: Mjolnir Security helps businesses create and maintain comprehensive incident response plans. These plans enable organizations to respond effectively and efficiently to data breaches or other cyber incidents, minimizing potential damage.
  3. Digital Forensics: In the event of a data breach, Mjolnir Security’s digital forensics specialists can investigate and gather crucial evidence to determine the cause and extent of the breach. This information can be invaluable in remediation efforts and preventing future incidents.
  4. Security Assessments and Penetration Testing: Mjolnir Security conducts comprehensive assessments of an organization’s security posture, identifying vulnerabilities and potential attack vectors. Regular penetration testing helps businesses stay ahead of emerging threats by simulating real-world attacks and assessing their ability to detect and respond to them.
  5. Security Awareness Training: Human error is often a significant factor in data breaches. Mjolnir Security provides security awareness training to educate employees on best practices, identifying phishing attempts, and other potential threats. An informed workforce is a critical line of defense against cyberattacks.
  6. Continuous Improvement: Mjolnir Security’s DFIR services are designed to evolve alongside the ever-changing threat landscape. By staying informed of the latest trends, tactics, and technologies, Mjolnir Security ensures that their clients are always one step ahead of potential adversaries.


Data breaches pose a significant risk to businesses and individuals alike. By learning from past incidents and implementing robust cybersecurity measures, organizations can protect themselves from the devastating consequences of a breach. Mjolnir Security’s Digital Forensics and Incident Response services offer comprehensive solutions to help businesses stay ahead of the curve and safeguard their critical assets. Investing in proactive cybersecurity measures is not just a prudent decision; it is a necessity in today’s digital landscape.

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