New York is home to major financial institutions, healthcare systems, government agencies, media organizations, universities, and transportation networks. That concentration of valuable data and critical infrastructure makes the state an important target for cyberattacks.
This timeline covers some of the largest and most significant publicly disclosed cybersecurity breaches affecting New York organizations or operations from 2011 through 2026, based on reported scale, disruption, and broader impact.
Major New York Cyber Security Breaches: 2011–2026
| Year | Organization | Attack Type | Reported Impact |
|---|---|---|---|
| 2011 | Citigroup | Website intrusion | Approximately 200,000 credit card accounts accessed |
| 2014 | JPMorgan Chase | Data breach | Information associated with 76 million households and 7 million small businesses exposed |
| 2021 | NYC Law Department | Cyberattack | Legal department systems disrupted for weeks |
| 2021 | Metropolitan Transportation Authority (MTA) | China-linked intrusion | Three of 18 systems affected; no customer data reported compromised |
| 2022 | Fast Company | Publishing platform compromise | Offensive push notifications sent through Apple News |
| 2022 | New York Racing Association | Ransomware | Operations disrupted and member information reportedly compromised |
| 2024 | Change Healthcare | ALPHV/BlackCat ransomware | Approximately 190 million individuals ultimately affected |
| 2026 | NYC Health + Hospitals | Data breach | Approximately 1.8 million patients affected, including sensitive medical and biometric information |
Note: This is not an official ranking. Incidents are selected based on publicly reported scope, number of people affected, operational disruption, and broader significance.
The Five Most Significant New York Cyber Breaches
1. Change Healthcare Cyberattack (2024)
The 2024 Change Healthcare ransomware attack became one of the most consequential healthcare cyber incidents in the United States.
Change Healthcare, a UnitedHealth Group subsidiary, was compromised by the ALPHV/BlackCat ransomware operation. UnitedHealth reportedly paid a $22 million ransom.
The attack disrupted healthcare payment processing and other services across the United States, affecting pharmacies, healthcare providers, and other organizations that depended on Change Healthcare’s infrastructure.
Subsequent breach notifications substantially increased the number of affected individuals, eventually reaching approximately 190 million people.
Why it matters
The incident demonstrated how compromising a major healthcare technology provider can create widespread disruption across an entire industry.
It also highlighted the cybersecurity risks associated with third-party providers and interconnected healthcare systems.
For organizations concerned about ransomware preparedness and recovery, TechFusion provides ransomware recovery services.
2. NYC Health + Hospitals Data Breach (2026)
In 2026, NYC Health + Hospitals disclosed a data breach affecting approximately 1.8 million patients.
The exposed information reportedly included personal information, medical records, and fingerprint biometric data.
According to public reporting cited for this article, attackers were present in the environment from approximately late November 2025 until February 2026, when the intrusion was detected.
The reported involvement of a third-party vendor makes the incident particularly significant.
Why it matters
Medical information is highly sensitive, while biometric information presents an additional challenge because fingerprints cannot simply be changed after exposure.
The incident demonstrates the importance of securing both internal systems and third-party access to healthcare environments.
Organizations dealing with compromised devices, storage systems, or digital evidence may also require digital forensic investigation following an incident.
3. JPMorgan Chase Cyberattack (2014)
The 2014 JPMorgan Chase breach was one of the largest financial-sector data breaches reported in the United States at the time.
Approximately 76 million households and 7 million small businesses had contact information exposed.
The compromised information included names, addresses, phone numbers, and email addresses. Customer account credentials were reportedly not accessed.
The attack began months before the breach was publicly disclosed.
Why it matters
The incident demonstrated the scale that attacks against financial institutions can reach and the importance of strong authentication, network monitoring, and rapid breach detection.
New York remains a major financial-services market, making financial institutions an important cybersecurity target.
4. Metropolitan Transportation Authority Cyberattack (2021)
In April 2021, the Metropolitan Transportation Authority (MTA) experienced a cyber intrusion attributed in public reporting to China-linked hackers.
The attackers exploited a vulnerability associated with Pulse Connect Secure remote-access technology.
The MTA reported that three of its 18 systems were affected. It also reported that customer data was not compromised and that transportation operations were not disrupted.
Why it matters
The incident demonstrates that transportation infrastructure can be targeted even when an attack does not immediately disrupt public services.
It also highlighted the risks associated with vulnerabilities in remote-access systems.
5. Fast Company Cyberattack (2022)
In September 2022, attackers compromised Fast Company’s publishing infrastructure.
The attackers used the compromised platform to send racist and offensive push notifications through Apple News.
Fast Company temporarily took its website offline while investigating the incident.
Why it matters
The incident demonstrates that cyberattacks are not limited to stealing personal or financial information.
Compromising a publishing or content-management platform can allow attackers to damage a company’s reputation and directly communicate malicious content to its audience.
Other Significant New York Cyber Incidents
Citigroup (2011)
Citigroup reported a website intrusion in 2011 that exposed information associated with approximately 200,000 credit card accounts.
The incident illustrates the continuing importance of web application security and customer-data protection in financial services.
NYC Law Department (2021)
The New York City Law Department experienced a cyberattack that disrupted department systems for an extended period.
The incident demonstrated the potential operational impact of attacks against government organizations.
New York Racing Association (2022)
The New York Racing Association was reportedly targeted by the Hive ransomware group in 2022.
The attack reportedly disrupted operations and involved the compromise of member information.
What These New York Cyber Breaches Show
Several patterns stand out across the incidents.
Healthcare attacks can have enormous downstream impact
The Change Healthcare and NYC Health + Hospitals incidents demonstrate how attacks against healthcare organizations and technology providers can expose sensitive information and disrupt critical services.
Financial services remain a high-value target
The JPMorgan breach shows the scale that financial-sector attacks can reach, particularly when attackers gain access to large customer databases.
Third-party risk is increasingly important
Vendor and technology-provider access can create additional attack paths into otherwise protected organizations.
Operational disruption matters as much as stolen data
The MTA, NYC Law Department, Change Healthcare, and New York Racing Association incidents demonstrate that cyberattacks can disrupt essential operations even when the primary objective is not simply data theft.
For organizations recovering from ransomware or data loss, TechFusion’s data recovery services can help with recovery from damaged or compromised storage systems.
New York Cybersecurity Laws and Regulations
Organizations operating in New York may be subject to different cybersecurity and breach-notification requirements depending on their industry and the information they maintain. Part 500 sets requirements for cybersecurity programs, access controls, governance, incident response, and reporting. Organisations without in-house security teams can meet these requirements by working with external cyber security services providers.
NY SHIELD Act
The New York SHIELD Act establishes security and breach-notification requirements for organizations that own or license certain private information belonging to New York residents.
NYDFS Cybersecurity Regulation (23 NYCRR Part 500)
The New York Department of Financial Services cybersecurity regulation applies to covered financial-services organizations.
It establishes requirements relating to cybersecurity programs, authentication, governance, incident response, and breach reporting.
HIPAA
Healthcare organizations and their business associates may also be subject to HIPAA requirements governing protected health information.
HIPAA is a federal regulation rather than a New York-specific law.
Frequently Asked Questions
What was the largest cyber breach affecting New York?
There is no single official ranking of the largest cyber breach affecting New York because incidents can be measured by different criteria.
By the number of people ultimately affected, the 2024 Change Healthcare incident is among the largest incidents discussed here, with subsequent notifications reaching approximately 190 million affected individuals nationwide.
What was the largest breach involving a New York-based organization?
The 2026 NYC Health + Hospitals breach affected approximately 1.8 million patients, according to the public reporting cited for this article.
The incident was particularly significant because the reported exposed information included medical and biometric data.
What industries are targeted by cyberattacks in New York?
Financial services, healthcare, government, transportation, media, and other organizations operating large or interconnected technology environments can face significant cyber risk.
What should an organization do after a cyberattack?
Organizations should activate their incident-response procedures, involve appropriate legal and cybersecurity professionals, preserve evidence, and determine the scope of the incident before beginning major recovery actions.
Organizations can also consult the CISA #StopRansomware Guide for federal guidance on ransomware prevention, response, and recovery.
Final Takeaway
The largest cybersecurity breaches affecting New York demonstrate that cyber risk extends across healthcare, financial services, government, transportation, and media.
The incidents also show that the impact of a cyberattack cannot be measured only by the amount of data stolen. Operational disruption, third-party dependencies, regulatory exposure, reputational damage, and recovery costs can all increase the consequences.
For organizations dealing with ransomware, data loss, or suspected unauthorized access, TechFusion provides digital forensics, ransomware recovery services, and data recovery services for organizations affected by cyber incidents.
Call TechFusion at 617-491-1001 or contact TechFusion for assistance.