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5.5 million patients' information exposed by major healthcare data breach

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5.5 million patients' information exposed by major healthcare data breach

Healthcare seems to be the favorite target of attackers this year. It’s been only four months, and we’ve already seen some of the biggest data breaches in the sector. Recently, news about the Blue Shield of California data breach came to light, leaking the personal data of 4.7 million people. 

But if that wasn’t enough, Connecticut’s largest healthcare system, Yale New Haven Health, has now revealed that a data breach affected more than 5.5 million people. 

The information leaked included patient names, dates of birth, postal and email addresses, phone numbers and more.

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Illustration of a hacker at work. (Kurt “CyberGuy” Knutsson)

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What you need to know

According to a legally mandated disclosure with the U.S. Department of Health and Human Services, Yale New Haven Health experienced a cyberattack on March 8 that allowed malicious hackers to obtain copies of patients’ personally identifiable information as well as some healthcare-related data.

Yale New Haven Health is a nonprofit healthcare system based in New Haven, Connecticut. It includes five acute-care hospitals, a medical foundation, and a network of outpatient facilities and multispecialty centers across Connecticut, New York and Rhode Island.

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In a notice posted on its website, the healthcare system said the stolen data varied by individual but could include names, dates of birth, postal and email addresses, phone numbers, race and ethnicity information, Social Security numbers, types of patients and medical record numbers. Reportedly, the number of affected individuals may still change as investigations continue. Importantly, electronic medical record systems and treatment information were not accessed, and no financial account, payment or employee HR information was involved. 

This is not the first time healthcare systems have been in the crosshairs of cybercriminals. In recent years, attacks on institutions like UnitedHealth and Ascension Health have led to months of operational disruption, massive financial costs and prolonged investigations.

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Illustration of a doctor looking at data on a phone. (Kurt “CyberGuy” Knutsson)

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What Yale New Haven Health is doing

Yale New Haven Health brought in cybersecurity firm Mandiant to assist with the investigation and said a rapid response helped contain the incident and prevent any disruption to patient care. The organization noted that it regularly updates and strengthens its systems to protect sensitive data and will continue those efforts. Notification letters began going out to affected individuals on April 14, and complimentary credit monitoring and identity theft protection services have been offered to those whose Social Security numbers were compromised.

The breach could have serious consequences for those impacted. The stolen data includes highly sensitive information that can be used for identity theft, financial fraud, phishing attacks or targeted scams. Healthcare data is especially valuable on the black market because it can be exploited for long periods without easy detection. Even if Social Security numbers or medical information aren’t misused right away, the long-term risk for affected individuals remains significant.

We reached out to Yale New Haven Health (YNHHS), and a health system spokesperson said in part:

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“We take our responsibility to safeguard patient information incredibly seriously, and we regret any concern this incident may have caused. We are continuously updating and enhancing our systems to protect the data we maintain and to help prevent events such as this from occurring in the future. For more information on this incident, patients may visit YNHHS’ website at ynhhs.org or call our dedicated, toll-free call center at 1-855-549-2678, Monday through Friday, between 9:00 am and 9:00 pm Eastern Time, excluding major U.S. holidays.”

A healthcare employee working on a laptop. (Kurt “CyberGuy” Knutsson)

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5 ways you can stay safe from insurance data breach

If your information was part of the Yale New Haven Health breach or any similar one, it’s worth taking a few steps to protect yourself.

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1. Consider identity theft protection services: Since the Yale New Haven Health data breach exposed personal and financial information, it’s crucial to stay proactive against identity theft. Identity theft protection services offer continuous monitoring of your credit reports, social security number, and even the dark web to detect if your information is being misused. These services send you real-time alerts about suspicious activity, such as new credit inquiries or attempts to open accounts in your name, helping you act quickly before serious damage occurs. Beyond monitoring, many identity theft protection companies provide dedicated recovery specialists who assist you in resolving fraud issues, disputing unauthorized charges and restoring your identity if it’s compromised. See my tips and best picks on how to protect yourself from identity theft. 

2. Use personal data removal services: The Yale New Haven Health data breach leaks loads of information about you, and all this could end up in the public domain, which essentially gives anyone an opportunity to scam you.  

One proactive step is to consider personal data removal services, which specialize in continuously monitoring and removing your information from various online databases and websites. While no service promises to remove all your data from the internet, having a removal service is great if you want to constantly monitor and automate the process of removing your information from hundreds of sites continuously over a longer period of time. Check out my top picks for data removal services here.

3. Have strong antivirus software: Yale New Haven Health hackers have people’s email addresses and full names, which makes it easy for them to send you a phishing link that installs malware and steals all your data. These messages are socially engineered to catch them, and catching them is nearly impossible if you’re not careful. However, you’re not without defenses.. 

The best way to safeguard yourself from malicious links that install malware, potentially accessing your private information, is to have strong antivirus software installed on all your devices. This protection can also alert you to phishing emails and ransomware scams, keeping your personal information and digital assets safe. Get my picks for the best 2025 antivirus protection winners for your Windows, Mac, Android and iOS devices

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4. Enable two-factor authentication: While passwords weren’t part of the data breach, you still need to enable two-factor authentication (2FA). It gives you an extra layer of security on all your important accounts, including email, banking and social media. 2FA requires you to provide a second piece of information, such as a code sent to your phone, in addition to your password when logging in. This makes it significantly harder for hackers to access your accounts, even if they have your password. Enabling 2FA can greatly reduce the risk of unauthorized access and protect your sensitive data.

5. Be wary of mailbox communications: Bad actors may also try to scam you through snail mail. The data leak gives them access to your address. They may impersonate people or brands you know, and use themes that require urgent attention, such as missed deliveries, account suspensions and security alerts. 

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Kurt’s key takeaway

While Yale New Haven has been working with security experts to contain the breach and notify those affected, it is troubling that hackers were able to access the data of 5.5 million individuals before the organization detected the intrusion. The incident highlights a deeper issue, revealing gaps in the security infrastructure that many healthcare institutions are still not adequately addressing.

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Here’s your first look at Kratos in Amazon’s God of War show

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Here’s your first look at Kratos in Amazon’s God of War show

Amazon has slowly been teasing out casting details for its live-action adaptation of God of War, and now we have our first look at the show. It’s a single image but a notable one showing protagonist Kratos and his son Atreus. The characters are played by Ryan Hurst and Callum Vinson, respectively, and they look relatively close to their video game counterparts.

There aren’t a lot of other details about the show just yet, but this is Amazon’s official description:

The God of War series storyline follows father and son Kratos and Atreus as they embark on a journey to spread the ashes of their wife and mother, Faye. Through their adventures, Kratos tries to teach his son to be a better god, while Atreus tries to teach his father how to be a better human.

That sounds a lot like the recent soft reboot of the franchise, which started with 2018’s God of War and continued through Ragnarök in 2022. For the Amazon series, Ronald D. Moore, best-known for his work on For All Mankind and Battlestar Galactica, will serve as showrunner. The rest of the cast includes: Mandy Patinkin (Odin), Ed Skrein (Baldur), Max Parker (Heimdall), Ólafur Darri Ólafsson (Thor), Teresa Palmer (Sif), Alastair Duncan (Mimir), Jeff Gulka (Sindri), and Danny Woodburn (Brok).

While production is underway on the God of War series, there’s no word on when it might start streaming.

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300,000 Chrome users hit by fake AI extensions

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300,000 Chrome users hit by fake AI extensions

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Your web browser may feel like a safe place, especially when you install helpful tools that promise to make your life easier. But security researchers have uncovered a dangerous campaign in which more than 300,000 people installed Chrome extensions pretending to be artificial intelligence (AI) assistants. Instead of helping, these fake tools secretly collect sensitive information like your emails, passwords and browsing activity.

They used familiar names like ChatGPT, Gemini and AI Assistant. If you use Chrome and have installed any AI-related extension, your personal information may already be exposed. Even worse, some of these malicious extensions are still available today, putting more people at risk without their knowing.

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More than 300,000 Chrome users installed fake AI extensions that secretly harvested sensitive data. (Kurt “CyberGuy” Knutsson)

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What you need to know about fake AI extensions

Security researchers at browser security company LayerX discovered a large campaign involving 30 malicious Chrome extensions disguised as AI-powered assistants (via BleepingComputer). Together, these extensions were installed more than 300,000 times by unsuspecting users.

Some of the most popular extensions included names like AI Sidebar with 70,000 users, AI Assistant with 60,000 users, ChatGPT Translate with 30,000 users, and Google Gemini with 10,000 users. Another extension called Gemini AI Sidebar had 80,000 users before it was removed.

These extensions were distributed through the official Chrome Web Store, which made them appear legitimate and trustworthy. Even more concerning, researchers found that many of these extensions were connected to the same malicious server, showing they were part of a coordinated effort.

While some extensions have since been removed, others remain available. This means new users could still unknowingly install them and expose their personal data. Here’s the list of the affected extensions:

  • AI Assistant
  • Llama
  • Gemini AI Sidebar
  • AI Sidebar
  • ChatGPT Sidebar
  • Grok
  • Asking ChatGPT
  • ChatGBT
  • Chat Bot GPT
  • Grok Chatbot
  • Chat With Gemini
  • XAI
  • Google Gemini
  • Ask Gemini
  • AI Letter Generator
  • AI Message Generator
  • AI Translator
  • AI For Translation
  • AI Cover Letter Generator
  • AI Image Generator ChatGPT
  • Ai Wallpaper Generator
  • Ai Picture Generator
  • DeepSeek Download
  • AI Email Writer
  • Email Generator AI
  • DeepSeek Chat
  • ChatGPT Picture Generator
  • ChatGPT Translate
  • AI GPT
  • ChatGPT Translation
  • ChatGPT for Gmail

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These malicious tools were listed in the official Chrome Web Store, making them appear legitimate and trustworthy. (LayerX)

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How the fake AI Chrome extension attack works

These fake extensions pretend to offer helpful AI features, such as translating text, summarizing emails, or acting as an AI assistant. But behind the scenes, they quietly monitor what you are doing online.

Once installed, the extension gains permission to view and interact with the websites you visit. This allows it to read the contents of web pages, including login screens where you enter your username and password.

In some cases, the extensions specifically targeted Gmail. They could read your email messages directly from your browser, including emails you received and even drafts you were still writing. This means attackers could access private conversations, financial information and sensitive personal details.

The extensions then sent this information to servers controlled by the attackers. Because they loaded content remotely, the attackers could change their behavior at any time without needing to update the extension.

Some versions could also activate voice features through your browser. This could potentially capture spoken conversations near your device and send transcripts back to the attackers.

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If you installed one of these extensions, attackers may already have access to extremely sensitive information. This includes your email content, login credentials, browsing habits and possibly even voice recordings.

We reached out to Google for comment, and a spokesperson told CyberGuy that the company “can confirm that the extensions from this report have all been removed from the Google Web Store.”

BROWSER EXTENSION MALWARE INFECTED 8.8M USERS IN DARKSPECTRE ATTACK

Once installed, the extensions could read emails, capture passwords, monitor browsing activity and send the data to attacker-controlled servers. (Bildquelle/ullstein bild via Getty Images)

7 ways you can protect yourself from malicious Chrome extensions

If you have ever installed an AI-related Chrome extension, taking a few simple precautions now can help protect your accounts and prevent further damage.

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1) Remove any suspicious or unused browser extensions

On a Windows PC or Mac, open Chrome and type chrome://extensions into the address bar. Review every extension listed. If you see anything unfamiliar, especially AI assistants you don’t remember installing, click “Remove” immediately. Malicious extensions depend on going unnoticed. Removing them stops further data collection and cuts off the attacker’s access to your information.

2) Change your passwords

If you installed any suspicious extension, assume your passwords may be compromised. Start by changing your email password first, since email controls access to most other accounts. Then update passwords for banking, shopping and social media accounts. This prevents attackers from using stolen credentials to break into your accounts.

3) Use a password manager to create and protect strong passwords

A password manager generates unique, complex passwords for each account and stores them securely. This prevents attackers from accessing multiple accounts if one password is stolen. Password managers also alert you if your login credentials appear in known data breaches, helping you respond quickly and protect your identity. Check out the best expert-reviewed password managers of 2026 at Cyberguy.com.

4) Install strong antivirus software and keep it active

Good antivirus software can detect malicious browser extensions, spyware, and other hidden threats. It scans your system for suspicious activity and blocks harmful programs before they can steal your information. This adds an important layer of protection that works continuously in the background to keep your device safe. Get my picks for the best 2026 antivirus protection winners for your Windows, Mac, Android & iOS devices at Cyberguy.com.

5) Use an identity theft protection service

Identity theft protection services monitor your personal data, including email addresses, financial accounts, and Social Security numbers, for signs of misuse. If criminals try to open accounts or commit fraud using your information, you receive alerts quickly. Early detection allows you to act fast and limit financial and personal damage. See my tips and best picks on how to protect yourself from identity theft at Cyberguy.com.

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6) Keep your browser and computer fully updated

Software updates fix security vulnerabilities that attackers exploit. Enable automatic updates for Chrome and your operating system so you always have the latest protections. These updates strengthen your defenses against malicious extensions and prevent attackers from taking advantage of known weaknesses.

7) Use a personal data removal service

Personal data removal services scan data broker websites that collect and sell your personal information. They help remove your data from these sites, reducing what attackers can find and use against you. Less exposed information means fewer opportunities for criminals to target you with scams, identity theft or phishing attacks.

Check out my top picks for data removal services and get a free scan to find out if your personal information is already out on the web by visiting Cyberguy.com.

Get a free scan to find out if your personal information is already out on the web: Cyberguy.com.

Kurt’s key takeaway

Even tools designed to make your life easier can become tools for cybercriminals. Malicious extensions often hide behind trusted names and convincing features, making them difficult to spot. You can significantly reduce your risk by reviewing your browser extensions regularly, removing anything suspicious and using protective tools like password managers and strong antivirus software.

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Have you checked your browser extensions recently? Let us know your thoughts by writing to us at Cyberguy.com.

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Anthropic refuses Pentagon’s new terms, standing firm on lethal autonomous weapons and mass surveillance

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Anthropic refuses Pentagon’s new terms, standing firm on lethal autonomous weapons and mass surveillance

Less than 24 hours before the deadline in an ultimatum issued by the Pentagon, Anthropic has refused the Department of Defense’s demands for unrestricted access to its AI.

It’s the culmination of a dramatic exchange of public statements, social media posts, and behind-the-scenes negotiations, coming down to Defense Secretary Pete Hegseth’s desire to renegotiate all AI labs’ current contracts with the military. But Anthropic, so far, has refused to back down from its two current red lines: no mass surveillance of Americans, and no lethal autonomous weapons (or weapons with license to kill targets with no human oversight whatsoever). OpenAI and xAI had reportedly already agreed to the new terms, while Anthropic’s refusal had led to CEO Dario Amodei being summoned to the White House this week for a meeting with Hegseth himself, in which the Secretary reportedly issued an ultimatum to the CEO to back down by the end of business day on Friday or else.

In a statement late Thursday, Amodei wrote, “I believe deeply in the existential importance of using AI to defend the United States and other democracies, and to defeat our autocratic adversaries. Anthropic has therefore worked proactively to deploy our models to the Department of War and the intelligence community.”

He added that the company has “never raised objections to particular military operations nor attempted to limit use of our technology in an ad hoc manner” but that in a “narrow set of cases, we believe AI can undermine, rather than defend, democratic values” — going on to specifically mention mass domestic surveillance and fully autonomous weapons. (Amodei mentioned that “partial autonomous weapons … are vital to the defense of democracy” and that fully autonomous weapons may eventually “prove critical for our national defense,” but that “today, frontier AI systems are simply not reliable enough to power fully autonomous weapons.” He did not rule out Anthropic acquiescing to the military’s use of fully autonomous weapons in the future but mentioned that they were not ready now.)

The Pentagon had already reportedly asked major defense contractors to assess their dependence on Anthropic’s Claude, which could be seen as the first step to designating the company a “supply chain risk” – a public threat that the Pentagon had made recently (and a classification usually reserved for threats to national security). The Pentagon was also reportedly considering invoking the Defense Production Act to make Anthropic comply.

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Amodei wrote in his statement that the Pentagon’s “threats do not change our position: we cannot in good conscience accede to their request.” He also wrote that “should the Department choose to offboard Anthropic, we will work to enable a smooth transition to another provider, avoiding any disruption to ongoing military planning, operations, or other critical missions. Our models will be available on the expansive terms we have proposed for as long as required.”

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