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Healthcare cyberattacks hit pacemakers and millions of patient records

Theregister • August 31, 2026

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Two major healthcare businesses, Boston Scientific and McKesson, disclosed more details over the weekend separate cyberattacks that disrupted global operations and resulted in stolen patient data, respectively.

Medical-device maker Boston Scientific, whose IT systems were hacked by unknown intruders last week , said the cyberattack remains ongoing. It also noted that pacemakers and other heart devices implanted after the August 25 breach cannot provide remote monitoring and data transmission as intended.

“New remote monitoring communicators cannot be activated, thus available device data will NOT be transmitted to remote patient management systems until the communicator can be activated,” the medtech firm said in a late Friday update.

This applies to all new cardiac rhythm management implants other than insertable cardiac monitors (ICM).

ICM devices must be activated using the Boston Scientific Clinic Assistant app to ensure the device correctly records patients’ heart rhythms, the company added.

Because of the cyberattack, “new ICMs are unable to pair to the patient remote monitoring mobile phone, therefore available episode data recorded by the ICM will NOT be transmitted to the remote monitoring system until the ICM can be paired to the patient mobile app,” according to the update.

The devices will still record any episodes, and patients can transmit these to the remote monitoring system by in-person transmission via the Clinic Assistant app. This is done by selecting the “interrogate” button, according to the company.

Once its IT systems are back up and running, and the heart devices can pair with monitoring equipment, they will again transmit recorded data to the remote systems.

However, the company does not have a timeline for full restoration. “We are currently working on restoring affected functions and systems access,” Boston Scientific said on Saturday.

The digital intrusion also affected the firm’s manufacturing, shipping, and ordering, it noted. “We are expeditiously working towards partial restoration for the shipping of some products this week,” according to a Sunday update. “Once we can demonstrate the restoration is fully operable, we anticipate ordering and shipping will ramp up to full capacity.”

Boston Scientific has hired CrowdStrike to assist with the investigation and restoration efforts, and said the attack did not affect its cloud-based systems and apps - just “certain on-premise systems” - and added that it has seen no indication of unauthorized IT activity since August 25.

The firm has repeatedly declined to answer The Register ’s questions the compromise, including whether it was a ransomware infection and which criminal crew is responsible.

McKesson confirms breach as ShinyHunters claims responsibility

Meanwhile, in another cybersecurity incident that has been very publicly claimed by the criminal perpetrator: pharmaceutical and medical supply giant McKesson over the weekend confirmed an intrusion after ShinyHunters on Friday told The Register it broke into the company’s Snowflake and Salesforce instances and stole millions of patients’ data.

“Based on our investigation thus far, including assessments by leading cybersecurity industry experts supporting our response, we’ve confirmed that the unauthorized access to certain third-party applications and the exfiltration of certain data was associated with a subset of customers within our Oncology & Multispecialty and Medical-Surgical business units,” Francisco Fraga, McKesson executive VP, chief information officer and chief technology officer, said in a Saturday statement.

The medical firm did not immediately respond to The Register ’s questions, including how many patients were affected and what “certain data” was stolen. McKesson supports 3,300 oncology providers in 29 states, according to its website.

Fraga’s statement noted that distribution centers remain operational and McKesson continues to ship products. The firm has “reasonable assurance” that the digital intruders have been kicked out of the third-party environments and aren’t lurking around McKesson’s systems, he added.

A ShinyHunters spokesperson told us that the notorious extortion group compromised more than 284 million records of patient data, and demanded McKesson pay $55.2 million or else they would leak the stolen data.

However, as Have I Been Pwned boss Troy Hunt recently reminded everyone: Don’t confuse criminals’ claims with gospel truth, and “take headline numbers with a grain of salt unless you're confident in the processes of those making the claims."

This was after Hunt’s HIBP service reported 12.9 million individuals affected by retailer Carhartt’s alleged breach. This number was around half of what ShinyHunters claimed when they leaked the company’s data earlier this month.

The McKesson records, according to the ShinyHunters spokesperson, include patients’ full names, and email addresses, phone numbers, dates of birth, Social Security numbers, appointment dates and notes, and sensitive illness details including cancer locations on people’s bodies. The group also claims to have swiped emails containing private information from doctors to patients.

The spokesperson told us they accessed the company’s Snowflake and Salesforce instances by voice phishing “multiple employees.” This is a tried-and-true method popularized by the data-theft-and-extortion gang, which has victimized other medical providers in recent months. These include pacemaker manufacturer Medtronic in April, and cancer diagnostics business Exact Sciences in July. ®

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