Major cybersecurity breaches

Explore significant cyber incidents, data leaks, and hacks that have impacted government agencies, defense companies, and high-tech firms. This includes a timeline of major security compromises, focusing on the scale of exposed records, causes such as phishing, misconfigurations, and ransomware, and the long-term effects on individuals and organizations. Stay informed about the latest cybersecurity threats, malware, and ransomware attacks affecting leading companies and government entities.

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  1. 1

    "The 16 Billion Credential Mega Leak" (Mid-2025)

    0 Global Votes
    • Potentially the G.O.A.T. of all data breaches

      (+3)

    This breach is significant due to its unprecedented scale, exposing approximately 16 billion login credentials. It highlights the pervasive issue of password reuse and the widespread risk of credential stuffing attacks across numerous major online platforms.

  2. 2

    AT&T Customer Data Leak (May 2025)

    0 Global Votes

    This leak exposed personal details of over 86 million AT&T customers, including sensitive information like Social Security numbers. It led to significant legal and regulatory scrutiny, demonstrating the severe consequences of large-scale customer data compromise.

  3. 3

    Allianz Life Insurance Company of North America Breach (July 2025)

    0 Global Votes

    This breach impacted most of Allianz's 1.4 million U.S. customers through a third-party CRM platform. It exemplifies the growing risk posed by supply chain vulnerabilities and social engineering tactics targeting critical business services.

  4. 4

    Yale New Haven Health System Breach (March 2025)

    0 Global Votes
    • Largest healthcare breach reported in 2025 so far

      (+2)

    Affecting approximately 5.5 million individuals, this breach exposed highly sensitive patient information. It underscores the persistent vulnerability of healthcare systems to cyberattacks and the critical impact on patient privacy.

  5. 5

    700Credit Data Breach (December 2025)

    0 Global Votes

    As the largest provider of credit checks for automotive businesses, this breach affected over 5.8 million individuals. It demonstrates how compromised third-party APIs can serve as critical entry points for large-scale data exfiltration.

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  7. 6

    TransUnion Salesforce Database Breach (July 2025)

    0 Global Votes
    • Core credit database and credit reports remain secure

    This breach impacted over 4.4 million customers' sensitive data, including Social Security numbers, due to misconfigured API permissions. It showcases the dangers of improper cloud security configurations and the involvement of prominent threat actors like ShinyHunters.

  8. 7

    Qantas Data Breach (June 2025)

    0 Global Votes

    Nearly 6 million customer records were exfiltrated from Qantas, an Australian airline, by exploiting a third-party system. This incident highlights the vulnerability of major corporations to supply chain attacks and the impact on personally identifiable information.

  9. 8

    Red Hat GitLab Breach (October 2025)

    0 Global Votes

    The Crimson Collective exfiltrated 570 GB of data from Red Hat's internal repositories, including sensitive information from major enterprise clients. This breach reveals the severe consequences of compromising internal development platforms and the exposure of critical infrastructure data.

  10. 9

    Navia Data Breach (March 2026)

    0 Global Votes
    • Promptly responded to suspicious activity

      (+1)

    This breach impacted 2.7 million people through an exposed API, leading to the theft of personal and health-related data. It serves as a recent example of how API vulnerabilities continue to be a significant threat vector for sensitive information.

  11. 10

    Match Group Data Breach (Early 2026)

    0 Global Votes

    Hackers affiliated with ShinyHunters claimed to have breached Match Group, affecting major dating platforms and allegedly exposing 10 million records. This incident highlights the vulnerability of consumer-facing platforms and the potential for widespread user data compromise.

  12. 11

    Stryker Cyberattack (March 2026)

    0 Global Votes
    • No indication of ransomware or malware

      (+2)

    This large cyberattack on a medical technology company, linked to an Iran-aligned hacktivist group, saw computers wiped in real-time. It exemplifies the increasing trend of geopolitically motivated cyberattacks targeting critical infrastructure and organizations.

  13. 12

    149 Million Credential Exposure (Misconfigured Cloud Database) (January 2026)

    0 Global Votes

    This exposure of 149 million records was due to a publicly exposed and misconfigured cloud database. It serves as a stark reminder of the critical importance of proper cloud security configurations to prevent massive data leaks.

  14. 13

    Brightspeed Ransomware Attack (2026)

    0 Global Votes

    The Crimson Collective claimed to steal data from over a million Brightspeed customers, showcasing ransomware's continued prevalence. This attack highlights common entry points like phishing and unpatched vulnerabilities, leading to significant data theft.

  15. 14

    Nike Internal Data Breach (January 2026)

    0 Global Votes

    Nike launched an investigation after WorldLeaks claimed to have stolen 1.4 terabytes of internal company data, including product development IP. This breach highlights the risks associated with supply chain infrastructure and internal privilege misuse.

  16. 15

    Under Armour Data Leak (January 2026)

    0 Global Votes

    A customer dataset from Under Armour was released on a hacking forum, exposing 72 million email addresses and other sensitive data. This leak raises concerns about how such extensive email lists can be leveraged for future phishing and credential stuffing attacks.