Chinese state-sponsored hackers breached the Treasury Department's computer security guardrails this month, according to a letter to lawmakers that Treasury officials provided to Reuters.

Hackers have compromised several different companies' Chrome browser extensions in a series of intrusions dating back to mid-December, according to one of the victims and experts who have examined the campaign.

They said any bid to protect Americans' data would best be achieved through privacy legislation.

Officials in the United States and Israel have denied reports their countries had signed off on the sale of Israeli spyware maker Paragon to Florida-based AE Industrial Partners.

Hospital operator Ascension told Maine's state attorney general on Friday that nearly 5.6 million people were affected in a ransomware attack that hit it earlier this year.

The U.S. government is urging senior government officials and politicians to ditch phone calls and text messages following intrusions at major American telecommunications companies blamed on Chinese hackers.

Two Democratic senators and a host of environmental groups have called for investigations and accountability following a Reuters report that a lobbyist for Exxon Mobil had been investigated for its alleged role in a sweeping hack-and-leak operation that targeted prominent critics of the oil company.

The United States sanctioned a Chinese cybersecurity company over an ambitious cyberattack that U.S. Treasury officials say could have killed people.

A large number of Americans' metadata has been stolen in the sweeping cyberespionage campaign carried out by a Chinese hacking group dubbed "Salt Typhoon," a senior U.S. official told journalists on Wednesday.

Phone companies are denying the U.S. military's requests for data about vulnerabilities in the American telecom system, according to a letter released Wednesday.

A senior U.S. official who is among those working to evict alleged Chinese hackers from American telecom companies has a word of advice for his fellow Americans:

The FBI has been investigating a longtime Exxon Mobil consultant over the contractor's alleged role in a hack-and-leak operation that targeted hundreds of the oil company’s biggest critics, according to three people familiar with the matter.

American Muckrakers, a political action committee, is hosting a trove of material including Trump's campaign communications with external advisers and other allies.

Missouri-based aviation executive Farhad Azima said on Thursday he had settled with the law firm Dechert and two of its former senior attorneys over allegations they took part in a scheme to hack his emails and use them in court to destroy his business.

Russia is increasingly turning to American social media stars to covertly influence voters ahead of the 2024 presidential election, according to U.S. officials and recently unveiled criminal charges.

A Chinese hacking group exploited a software bug to compromise several internet companies in the United States and abroad, a cybersecurity firm said on Tuesday.

An Israeli private investigator sought by the United States over hack-for-hire allegations previously told colleagues that he had been questioned by FBI agents over his work for the Washington public affairs firm DCI Group, according to three people familiar with the matter.

An Israeli private investigator arrested over allegations of hacking on behalf of an unnamed U.S. lobbying firm was released because of a procedural error, British authorities said Thursday.

Technology firm Cisco Systems said that hackers have subverted some of its digital security devices to break in to government networks globally.

China is developing the "ability to physically wreak havoc" on U.S. critical infrastructure and its hackers are waiting "for just the right moment to deal a devastating blow", FBI Director Christopher Wray said on Thursday.