Advocate Aurora Health leaks 3 million patient’s data to big tech through webtracker installation

A hospital network in Wisconsin and Illinois fears visitor tracking code on its websites may have transmitted personal information on as many as 3 million patients to Meta, Google, and other third parties.

Advocate Aurora Health (AAH) reported the potential breach to the US government’s Health and Human Services. As well as millions of patients, AAH has 27 hospitals and 32,000 doctors and nurses on its books.


Essentially, AAH is saying that it placed analytics code on its online portals to get an idea of how many people visit and login to their accounts, what they use, and so on. It’s now determined that code – known also as trackers or pixels because they may be loaded onto pages as invisible single pixels – may have sent personal info from the pages patients had open to those providing the trackers, such as Facebook or Google.

You might imagine these trackers simply transmit a unique identifier and IP address for the visitor and some details about their actions on the site for subsequent analysis and record keeping. But it turns out these pixels can send back all sorts of things like search terms, your doctor’s name, and the illnesses you’re suffering from.


The data that may have been sent, though, is extensive: IP addresses, appointment information including scheduling and type, proximity to an AAH facility, provider information, digital messages, first and last name, insurance data, and MyChart account information may all have been exposed. AAH said financial and Social Security information was not compromised.


Earlier this year, it was shown that Meta’s pixels could collect a lot more than basic usage metrics, transmitting personal data to Zuckercorp even for people who didn’t have Facebook accounts. The same is true of other trackers, such as TikTok’s, which can gather personal data regardless of whether a website’s visitor has ever set a digital foot on the China-owned social network.

Generally speaking, site and app owners have control over how much or how little is collected by the trackers they place on their pages. You can configure which activities trigger a ping back to the pixel provider, such as Meta, which you can then review from a backend dashboard.

While the info exposed by AAH was not grabbed by hackers, it is now in the hands of Big Tech, which is a privacy concern no matter what those technology companies say.

AAH said it – like so many other organizations, government and private – was using the trackers to aggregate user data for analysis, and it only seems to have just occurred to the nonprofit that this data is private health information and shouldn’t really be fed into Meta or Google.


Source: Advocate Aurora Health in potential 3 million patient leak • The Register

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