Security researchers say they have evidence that ransomware gangs are hacking into large companies that rely on fully patched SonicWall firewalls. The researchers say it's likely the flaw is a "zero-day" bug currently unknown to SonicWall.

The U.S. insurance giant tells state regulators that Social Security numbers were among the personal information stolen in its mid-July cyberattack.

Gov. Tim Walz activated the state military's cyber forces to help ensure public services continue to run as the city of Saint Paul battles an ongoing cyberattack.

Google refused to tell a U.S. senator whether the company had received a secret U.K. surveillance order demanding access to encrypted data, similar to an order served on Apple earlier this year.

Google has suspended the Firebase account of Catwatchful following a TechCrunch investigation. The spyware operation was caught using Google's own servers to host and run its surveillance app, which was stealthily monitoring thousands of people's phones.

French authorities say they wiretapped a server used by the administrator to access their private messages, which revealed activities relating to cybercrime and ransomware attacks.

One of the hacked organizations reportedly includes the U.S. agency responsible for maintaining the country's stockpile of nuclear weapons. China-backed hackers have been observed carrying out the hacks targeting SharePoint servers.

These are our favorite cybersecurity books, both by fiction authors, as well as journalists and researchers. 

AI chatbots, assistants and agents are increasingly asking for gross levels of access to your personal data under the guise of needing your information to make them work.

The new SS7 bypass attack tricks phone operators into disclosing a cell subscriber's location, in some cases down to a few hundred meters.

Chainalysis said crypto thefts during the first half of 2025 were at record levels, thanks in large part to a single breach at a major crypto exchange.

The U.K. National Crime Agency said the suspects are in custody in relation to the hacks targeting Marks & Spencer, Harrods, and the Co-op.

These carrier security settings can prevent your phone number from being hijacked or stolen.

Accused hacker and Chinese national Xu Zewei was arrested in Italy at the request of U.S. prosecutors.

The fresh wave of attacks targeting airlines comes soon after the hackers hit the U.K. retail sector and the insurance industry.

The retail giant described the food shortages as "temporary supply challenges" following the cyberattack at its primary distributor, UNFI.

Prosecutors say the hacker stole information on 60 million students, an incident that matches the data breach at PowerSchool.

Schools in Toronto and North Carolina are reporting extortion attempts.

This glossary includes the most common terms and expressions TechCrunch uses in our security reporting, and explanations of how — and why — we use them.

Connecticut's largest healthcare provider said it was hit by ransomware in March.