A vulnerability in Twitter's software that exposed an undetermined number of owners of anonymous accounts to potential identity compromise last year was apparently exploited by a malicious actor, the social media company said Friday.
It did not confirm a report that data on 5.4 million users was offered for sale online as a result but said users worldwide were affected.
The breach is especially worrisome because many Twitter account owners, including human rights activists, do not disclose their identities in their profiles for security reasons that include fear of persecution by repressive authorities.
"This is very bad for many who use pseudonymous Twitter accounts," U.S. Naval Academy data security expert Jeff Kosseff .
The vulnerability allowed someone to determine during log-in whether a particular phone number or email address was tied to an existing Twitter account, thereby revealing account owners, the company said.
Twitter said it did not know how many users may have been affected, and stressed that no passwords were exposed.
"We can confirm the impact was global," a Twitter spokesperson said via email. "We cannot determine exactly how many accounts were impacted or the location of the account holders."
Twitter's acknowledgment in a blog post Friday followed detailing how data presumably obtained from the vulnerability was being sold on a popular hacking forum for US$30,000.
A security researcher discovered the flaw in January, informed Twitter and was paid a reported US$5,000 bounty. Twitter said the bug, introduced in a June 2021 software update, was immediately fixed.
Twitter said it learned about the data sale on the hacking forum from media reports and "confirmed that a bad actor had taken advantage of the issue before it was addressed."
It said it was directly notifying all account owners that it can confirm were affected.
"We are publishing this update because we aren't able to confirm every account that was potentially impacted, and are particularly mindful of people with pseudonymous accounts who can be targeted by state or other actors," the company said.
It recommended users seeking to keep their identities veiled not add a publicly known phone number or email address to their Twitter account.
"If you operate a pseudonymous Twitter account, we understand the risks an incident like this can introduce and deeply regret that this happened," it said.
The revelation of the breach comes while Twitter is in a legal battle with Tesla CEO Elon Musk over his attempt to back out from his previous offer to buy San Francisco-based Twitter for US$44 billion.
Florida's storm-battered Gulf Coast raced against a Category 5 hurricane Monday as workers sprinted to pick up heaps of appliances and other street debris left over from Helene two weeks ago and highways were clogged with people fleeing ahead of the storm.
With prayers, protests, and a heavy police presence, Canada has marked the anniversary of the Oct. 7, 2023, attack by Hamas on Israel that killed about 1,200 people and triggered an ongoing war.
Days after a political sign was erected outside Lululemon founder Chip Wilson's Vancouver mansion, the waterfront property has been vandalized with graffiti.
A disgraced Winnipeg high school football coach convicted of sexual assault and luring will spend 20 years behind bars.
Sammy Basso, who was the longest living survivor of the rare genetic disease progeria, has died at the age of 28, the Italian Progeria Association said on Sunday.
Two people are in hospital after they were chased and shot at in what appears to be an act of road rage before eventually flipping their car while trying to escape, police say.
Despite Hurricane Milton evolving into a Category 5 storm, Walt Disney World Resort remains open to the public and will operate as normal. However, the park announced Monday a few closures in an abundance of caution.
Toronto Coun. Michael Thompson 'forced himself on' a woman who awoke to find him standing over her after she fell asleep drunk, the Crown alleged Monday, as the five-day sexual assault trial of the six-term politician began in Bracebridge, Ont.
Hurricane Milton quickly intensified to a Category 5 storm on Monday, reaching the most dangerous rank on what's known as the Saffir-Simpson Hurricane Wind Scale.
A disgraced Winnipeg high school football coach convicted of sexual assault and luring will spend 20 years behind bars.
Toronto Coun. Michael Thompson 'forced himself on' a woman who awoke to find him standing over her after she fell asleep drunk, the Crown alleged Monday, as the five-day sexual assault trial of the six-term politician began in Bracebridge, Ont.
Days after a political sign was erected outside Lululemon founder Chip Wilson's Vancouver mansion, the waterfront property has been vandalized with graffiti.
The day after a minivan was set ablaze outside Vancouver City Hall, a 78-year-old man has been criminally charged.
Videos of a meteor streaking across the skies of southern Ontario have surfaced and small bits of the outer space rock may have made it to land, one astronomy professor says.
Two people are in hospital after they were chased and shot at in what appears to be an act of road rage before eventually flipping their car while trying to escape, police say.
Kamala Harris called Donald Trump 'incredibly irresponsible' for spreading falsehoods about the federal response to Hurricane Helene's destruction, offering especially sharp words as a new storm bears down on Florida with just weeks until Election Day.
Palestinian militants in Gaza fired a barrage of rockets into Israel on Monday as mourners marked the anniversary of the Oct. 7 attack, without disrupting a nearby ceremony. Here is the latest.
A canyoneer died in Zion National Park after falling between 150 and 200 feet near the the Upper Emerald Pool in southwest Utah, according to the National Park Service.
The mayor of a state capital in southern Mexico has been killed just one week after he took office, officials said Sunday.
Despite Hurricane Milton evolving into a Category 5 storm, Walt Disney World Resort remains open to the public and will operate as normal. However, the park announced Monday a few closures in an abundance of caution.
Republican presidential candidate Donald Trump said on Monday there are 'a lot of bad genes' in the United States, while discussing murders allegedly committed by immigrants living illegally in the United States.
Global Affairs Canada says it's chartering more flights from Lebanon this week to help Canadians leave the country as conflict escalates between Israel and Hezbollah.
Federal political parties appear to be locked in a game of chicken over a debate that has stalled almost all business in the House of Commons.
A newly released document shows federal cabinet ministers were warned in May 2022 that hostile states were targeting Canada's strategic interests, the integrity of Canadian institutions and democratic processes, and the ability of the public to exercise Charter-protected rights and freedoms.
Georgia's highest court reinstated a ban on nearly all abortions after about six weeks of pregnancy on Monday while it considers the U.S. state's appeal of last week's ruling by a lower court judge blocking the law.
Sammy Basso, who was the longest living survivor of the rare genetic disease progeria, has died at the age of 28, the Italian Progeria Association said on Sunday.
If your household has recently been hit by a power outage, here are ways to keep your food safe.
A spacecraft blasted off Monday to investigate the scene of a cosmic crash.
The best minds in science will be thrust from academic obscurity into the spotlight this week when the Nobel Prizes in physics, chemistry, and physiology or medicine are announced. However, there is no shortage of Nobel-worthy discoveries: Here are five breakthroughs that haven't resulted in a life-changing call from Stockholm — at least not yet.
Scientists announced on Thursday a milestone in neurobiological research with the mapping of the entire brain of an adult fruit fly, a feat that may provide insight into brains across the animal kingdom, including people.
Cissy Houston, the mother of the late Whitney Houston and a two-time Grammy winner who performed alongside superstar musicians like Elvis Presley, and Aretha Franklin, has died. She was 91.
Federal prosecutors in Nevada have dismissed a long-dormant sex abuse case against Nathan Chasing Horse.
Ticketmaster is enforcing new rules around how fans transfer Taylor Swift tickets amid a surge in reported scams.
The Federal Court of Appeal has dismissed a challenge to the construction of a massive rail-and-truck hub in the Greater Toronto Area, allowing the project to proceed.
Canada's telecommunications regulator says the country's largest cellphone carriers must take steps to make their international roaming rates more affordable.
FTX received court approval of its bankruptcy plan on Monday, which will allow it to fully repay customers using up to US$16.5 billion in assets recovered since the once-leading crypto exchange collapsed.
Gerontologist Jay Olshansky is used to backlash about his views on human longevity. Decades ago he and his coauthors predicted children, on average, would live to only age 85 — only 1 per cent to 5 per cent might survive until their 100th birthday.
'Eat more vegetables,' doctors and dietitians say over and over. But for many people, it’s hard to do, because they aren’t excited about veggies or just don’t like them.
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The Florida Panthers handed out dozens of rings at a private ceremony commemorating last season's Stanley Cup title to players, coaches, team executives, members of the athletic training and medical staff and more.
The NCAA Division I Council is considering making a landmark change in eligibility rules this week that would allow Canadian Hockey League players to compete at U.S. colleges, the American Hockey Coaches Association executive director said Monday.
Max Pacioretty has a new home. The Toronto Maple Leafs signed the veteran forward to a one-year contract Monday after he made the team out of training camp on a professional tryout.
New data from the Insurance Bureau of Canada (IBC) shows that even though claims for auto theft dropped in the first half of 2024 compared to their 2023 peak, the rates of reported theft remain well above those of years prior.
Tesla is recalling more than 27,000 Cybertrucks because the rearview camera image may not activate immediately after shifting into reverse, the fifth recall for the vehicle since it went on sale late last year.
A Pickering, Ont., student going to college to be a mechanic is shocked the engine in his two-year-old car will not be repaired under warranty after the dealership claimed he had been 'over-revving' the engine.
Videos of a meteor streaking across the skies of southern Ontario have surfaced and small bits of the outer space rock may have made it to land, one astronomy professor says.
A unique form of clouds made an appearance over the skies of Ottawa on Sunday evening.
Bernie Hicks, known as the ‘Batman of Amherst,’ always wanted to sit in a Batmobile until a kind stranger made it happen.
Bubi’s Awesome Eats, located on University Ave West took to social media to announce the closure on Friday.
Weeneebayko Area Health Authority and the Government of Ontario have awarded a $1.8 billion fixed-price contract to design, build and finance a new Far North hospital.
Manitobans are in cleanup mode after intense winds barreled through southern parts of the province this weekend.
Avry Wortman, 13, scored two touchdowns on Sunday during her team's win in the under 14 Greater Moncton Football Association.
A gargantuan gourd – affectionately named ‘Orangina’ by the urban gardeners who grew it in the front yard of their Vancouver home – earned the massive honour of being named B.C.’s heaviest giant pumpkin Saturday.
Chantal Kreviazuk is set to return to Winnipeg to mark a major milestone in her illustrious musical career.
Outside Rutie Mizrahi’s Vancouver home hang blue and white lights on her front porch doorway. They were put up and turned on one year ago, and haven’t been turned off since.
The man accused of stealing a Vancouver police cruiser and taking it for a joyride in a public park over the weekend has been criminally charged, authorities announced Monday.
The second phase of a planned massive tree removal in Stanley Park is on the agenda at the park board Monday night.
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Less than 48 hours after his Monterey Park townhome was gutted by a fiery explosion, Calgarian Owen DeFoe returned on Monday to see what was left.
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An event was held in Ottawa to honour the victims on the anniversary of the worst attack against Jewish people since the Holocaust.
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The Renfrew County Joint Transportation Consortium (RCJTC) and school bus operators have reached a contract agreement in principle.
Montreal students and supporters showed their grief and anger at protests and vigils as they marked the anniversary of the current war between Israel and Gaza.
Celine Dion introduced the marquee Dallas Cowboys - Pittsburgh Steelers Sunday Night Football game before getting drenched by orange Gatorade.
There is not one space in the Look family home that isn't somehow connected to Alexandre – from the paintings on the wall to the tequila bottles he collected, his parents have spent the last year gathering his things and bringing them home.
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After four years of criticism, the Alberta government is considering changing how schools are funded
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CTV Atlantic meteorologist Kalin Mitchell has details on rain and downpours expected Monday through early Wednesday in the Maritimes, plus an update on Hurricane Milton.
For the first time in years, a direct flight from Halifax touched down at the JD McCurdy Sydney Airport on Monday.
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A disgraced Winnipeg high school football coach convicted of sexual assault and luring will spend 20 years behind bars.
After concerns were raised in the summer, it appears some 7-Eleven stores in Winnipeg may be shutting down because of crime.
One year has passed since Hamas militants murdered 1,200 Israelis and took more than 200 people hostage. Since the horrific attack, nearly 42,000 people have been killed in Gaza, as the war between Israel and Hamas rages on.
Regina resident Murray Yagelniski says a city-owned tree on his property is the root of the issue behind his basement flooding.
The Saskatchewan NDP says the province's troubled payment and scheduling system for healthcare is only half implemented and has costed taxpayers nearly triple its original price tag so far.
The John Howard Society of Saskatchewan will appear in front of the Supreme Court of Canada on Tuesday challenging a regulation that it says lets correctional workers discipline inmates without sufficient proof.
Communities across Canada, including in Waterloo Region, are marking one year since the Oct. 7 attack that sparked the Israel-Hamas war.
In September, Â鶹ӰÊÓ Kitchener reported on Sandvine's deals with autocratic governments, including Egypt, where its tech reportedly helped inject spyware into the devices of government critics.
The penalty hearing for Guelph Police constable Corey McArthur has heard from two character witnesses, both supporting an eventual return to policing for the officer who has admitted to assaulting a teen who was handcuffed to a hospital bed.
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A 36-year-old woman accused of sexually assaulting, physically assaulting and threatening residents at a Saskatchewan care home, was not in court when her matters were spoken to Monday afternoon.
Saskatoon mayoral candidate Cynthia Block says the city needs a new deal with Ottawa to keep life affordable.
Ontario Provincial Police are investigating a fatal crash of a side-by-side off-road vehicle east of Parry Sound that killed one and injured another Friday.
For decades, Mississauga First Nation has known that human remains from their land were at the Canadian Museum of History.
The Federation of Northern Ontario Municipalities (FONOM) is the latest organization to call on the Doug Ford government to re-open dialogue with an airline service that transports lower-income Canadians to crucial medical care far from home.
London police are investigating a break and enter and shooting incident that happened this past weekend and are looking for the two suspects involved.
Emotions have boiled over after a judge acquitted two out of three defendants in a manslaughter case, while the third accused has since died
Videos of a meteor streaking across the skies of southern Ontario have surfaced and small bits of the outer space rock may have made it to land, one astronomy professor says.
The cause of a fire that caused significant damage to a home in Oro-Medonte over the weekend is under investigation.
One person was taken to the hospital with what police describe as minor injuries after a loose wheel caused a collision on Highway 400 in Bradford on Monday.
Police are driving attention to an unsolved homicide that happened in broad daylight over a year ago in Tay Township in hopes someone holds the key that can move the case forward.
Chrysler’s parent company, Stellantis, has filed nine lawsuits against the United Auto Workers (UAW) and 23 individual local units, saying the union violated its contract by threatening to strike over the company’s future plans.
The Ambassador Bridge border crossing was 'temporarily closed' for a period of time, according to the Canada Border Services Agency website.
On Oct. 7, 2023, Hamas-led militants launched air and ground attacks on Israel, killing nearly 1,200 and taking more than 250 hostages.
Major crime investigators have been called to the scene of a suspected homicide in the northern Vancouver Island community of Port Hardy.
The day after a minivan was set ablaze outside Vancouver City Hall, a 78-year-old man has been criminally charged.
A Canadian soldier who was exposed to toxic chemicals from burn pits while serving in Afghanistan has been awarded full medical compensation for testicular cancer after Veterans Affairs initially denied his claim.
Nearly two years after a man was stabbed to death in downtown Kelowna, RCMP have made an arrest in the case.
NDP Leader David Eby is promising to offer a $75-million loan forgiveness program to entice doctors, nurses and heath professionals to expand health-care services in rural British Columbia.
Three young suspects have been arrested in connection with a swarming attack on a teenager in B.C.'s Okanagan last week – and authorities have asked the public to stop circulating disturbing videos of the incident.
A Lethbridge police officer involved in a scandal involving former Lethbridge New Democrat MLA Shannon Phillips has been reprimanded.
Lethbridge police say a man who escaped from a psychiatric ward at the Chinook Regional Hospital has been found.
While the summer may be over, construction season in Lethbridge is not.
The Federation of Northern Ontario Municipalities (FONOM) is the latest organization to call on the Doug Ford government to re-open dialogue with an airline service that transports lower-income Canadians to crucial medical care far from home.
For decades, Mississauga First Nation has known that human remains from their land were at the Canadian Museum of History.
Greater Sudbury in partnership with the Organization for Economic Co-operation and Development, is hosting the organization's annual mining conference.
As millions in federal funding flow into a Labrador group whose claims of Inuit identity have been rejected by Indigenous organizations across Canada, a national Inuit leader worries the Liberal government is putting the rights of Indigenous Peoples at risk.
He may not have logged the fastest time or even gone the full distance, but residents of a Newfoundland town agree the goat who unexpectedly joined the local weekend half marathon was the event's undisputed champion.
A mother in a community where the cost of living is one of the highest in the country says grocery prices are 'inhumane' and retailers are putting profits ahead of people’s basic human right to food.
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