This week's events touched healthcare, retail, education, local government technology and the legal sector in Canada and the United States.

Quest Diagnostics told U.S. regulators in an 8-K filing that it learned of a cyberattack on Wednesday targeting Quanum, a system doctors' offices and hospitals use to request lab tests and handle billing. The company said the unauthorized access included certain patient records. It has notified law enforcement and is investigating.

The disclosure as indexed does not name the organisation.

Data breaches were reported at McCarthy Tétrault, Borden Ladner Gervais, Bennett Jones and Davies Ward Phillips & Vineberg. The firms say the damage has been contained and they are alerting affected parties.

In February 2026 a hacking group gained access to Loblaw's systems and customer account information. The Privacy Commissioner of Canada opened an investigation and Loblaw signed a compliance letter on October 21, 2026 agreeing to take additional measures. Loblaw has started directly notifying the individuals who were impacted.

A researcher found a publicly exposed CitySourced database with no password protection or encryption, holding about 42 million documents. Most were images of code violation reports. Some records held a decade's worth of names, physical addresses, email addresses and phone numbers. The database has since been restricted and it is unknown how long it was accessible.

Frontline Education began sending notification letters on October 26, 2026 about an incident involving Frontline Central and School Health Management. Its security team identified a vulnerability in a third party software product on August 14, 2026 that allowed unauthorized access. The last day of unauthorized activity was August 15 and the company says the incident has been fully remediated.

Pattison Food Group, which operates the More Rewards loyalty program through Save-On-Foods, Buy-Low Foods, PriceSmart Foods and Nesters stores, said customer data was accessed in a cybersecurity breach. Some B.C. grocery store customers are being warned they may be victims.