Major Cyberattacks of 2026: The Biggest Data Breaches, Leaks, and Ransomware Incidents So Far

If 2026 has demonstrated anything, it is that cybersecurity is no longer a secondary concern. It has become a central issue connected to many of the year’s biggest developments. Conflicts continue around the world, climate challenges persist, and public health concerns remain ever-present. Yet beneath these issues lies an increasingly influential digital landscape affecting nearly every aspect of modern life.

Cyber warfare is now occurring alongside traditional military conflict; governments are leveraging data in new ways, botnets are disrupting democratic processes, and nation-state actors are increasingly targeting civilian infrastructure. At the same time, ransomware groups continue to extort businesses, institutions, and public organizations for enormous payouts. Cyberattacks are becoming more sophisticated, more disruptive, and harder to defend against.

As the year reaches its midpoint, several major incidents stand out as examples of how cybersecurity threats continue to evolve.

Questions Continue Around DOGE’s Access to Social Security Data

More than a year after members of the Department of Government Efficiency (DOGE), led by Elon Musk, entered various federal agencies, concerns remain regarding the handling of highly sensitive government data.

Following DOGE’s involvement with the Social Security Administration, ongoing legal disputes continue to examine what happened to some of the nation’s most valuable personal records. One whistleblower alleged that a live copy of the Social Security database was transferred to an unsecured third-party server, potentially exposing the Social Security numbers and personal information of millions of Americans.

Court filings suggest uncertainty remains regarding what data was stored on the server. Reports indicate that DOGE signed an agreement with an external political advocacy organization that is investigating alleged voter fraud. Critics argue that any exposure of this information could create opportunities for misuse or politically motivated targeting.

Several lawmakers have warned that if the allegations are confirmed, the incident could rank among the largest data breaches ever involving U.S. government records.

Water and Energy Infrastructure Under Increasing Attack

Critical infrastructure has become a growing target for cybercriminals and state-backed hackers. Recent attacks across Europe have affected power facilities, water systems, and other essential services.

Incidents linked to Russia have targeted Poland’s energy grid, a thermal facility in Sweden, and a dam in Norway. Additional attacks against Polish water treatment facilities earlier this year highlighted the continued use of cyber operations amid broader geopolitical tensions.

Meanwhile, security experts have warned that Iranian hackers may be focusing greater attention on U.S. infrastructure following escalating tensions in the Middle East. Water utilities remain particularly vulnerable due to ageing systems and limited cybersecurity protections.

Iranian Hackers Accused in Destructive Stryker Attack

In March, medical technology company Stryker experienced a significant cyberattack, which U.S. authorities attributed to an Iranian government-linked hacking group.

The attackers reportedly gained access to the company’s systems and remotely wiped thousands of employees’ devices, causing widespread operational disruptions. The incident marked a notable shift from traditional Iranian espionage activities toward more destructive cyber tactics.

The attack affected company operations for days and ultimately had a measurable impact on Stryker’s financial performance during the quarter.

ShinyHunters Continue High-Profile Breach Campaigns

The hacking group known as ShinyHunters remained one of the most active cybercriminal organizations year, relying heavily on voice phishing and social engineering tactics.

One of the group’s most notable victims was education technology provider Instructure. Attackers compromised Canvas, the company’s learning management platform, stealing personal information belonging to more than 30 million students and staff members.

When ransom demands were not initially met, attackers reportedly returned and disrupted login systems during a critical exam period, affecting students across the United States. The company ultimately paid the ransom despite warnings from federal authorities.

Other reported victims include internet provider Charter, cruise operator Carnival, and organizations in the education, finance, and government sectors.

Supply Chain Attacks Hit Open Source Ecosystem

A series of software supply chain attacks has affected major open-source projects and security tools throughout 2026.

Products associated with organizations including Aqua Security, Bitwarden, Checkmarx, and other widely used platforms were reportedly compromised. In several cases, attackers inserted malicious code into software updates, enabling them to steal users’ credentials, passwords, and authentication tokens.

The attacks created ripple effects across the technology sector, affecting larger companies that relied on compromised software. Organisations OpenAI and Vercel were among those impacted by downstream exposure.

The incidents have reinforced concerns about the security of software supply chains and the growing risks facing the open-source ecosystem.

FBI Surveillance System Breach Raises National Security Concerns

In April, the FBI disclosed what officials described as a major cyber incident involving one of its surveillance systems.

Reports indicated that attackers gained access to an unclassified network containing information related to surveillance targets and communications monitoring operations. U.S. officials reportedly linked the intrusion to Chinese cyber actors.

The breach prompted mandatory notification procedures with Congress and raised concerns about the exposure of sensitive investigative information.

Hasbro Struggles Through Extended Cyber Disruption

Toy manufacturer Hasbro faced significant operational challenges after discovering hackers within its systems in late March.

Weeks after the initial incident, major portions of the company’s online operations remained unavailable. Hasbro, whose brands include Transformers, Peppa Pig, and Dungeons & Dragons, provided limited public information regarding the attack, including whether data was stolen or ransom demands were made.

Although the company stated that attackers were eventually removed from its systems, analysts expect the financial consequences of the disruption to continue affecting the business for months.

Growing Exposure of Passports and Driver Licences

One of the most concerning cybersecurity trends of 2026 has been the exposure of sensitive identity documents.

Millions of passport scans, driver licences, and other government-issued identification records have been left accessible online due to security errors affecting businesses ranging from hotel platforms and money-transfer services to visa-processing providers and prison communications systems.

Many of these incidents stemmed from simple configuration errors that could have been prevented through basic security practices.

The trend emerges as more online services require identity verification for access, while governments continue to implement age-verification systems. Security experts warn that growing collections of personal identity documents create attractive targets for cybercriminals and increase the potential consequences of future data breaches.

As organizations collect personal information more than ever before, securing that data remains one of the most pressing challenges facing governments, businesses, and consumers alike.