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Facebook CEO Mark Zuckerberg remotely testifying before a House Judiciary Subcommittee in July 2020. Photo: Mandel Ngan/POOL/AFP via Getty Images

A leaker said Saturday they are providing personal information on 533 million Facebook users, including phone numbers, locations, birthdates and other data.

The latest: Though the data is resurfacing, the issue connected to the leaked data was "found and fixed" in August 2019, a Facebook spokesperson told Axios in a statement.

How it worked: "With this ‘new’ case, we were provided with a sample of the data and it matched previously known data related to the Contact Importer vulnerability that was fixed in late August 2019," the company spokesperson said.

  • Facebook at the time disabled functionality that previously made it "possible to input multiple phone numbers and, by running an algorithm, connect which number matched to a specific user."

Why it matters: The data, which can be accessed for free, may be used by cybercriminals to steal identities and scam or extort money from victims, according to Alon Gal, CTO of cybercrime intelligence firm Hudson Rock, which discovered the leaked data.

  • Gal noted the database appears to be the same set of Facebook-connected phone numbers circulating since January and that was originally reported by Motherboard, per Reuters.

By the numbers: The leak includes data from 32 million users in the U.S., 11 million users in the UK, and 6 million users in India.

Of note: It contains phone numbers, Facebook IDs, full names, locations, birthdates, bios and email addresses. It notably does not contain password information.

  • The data is personal, but much of it is likely to be public already, though perhaps not in this form.

What they're saying: “A database of that size containing the private information such as phone numbers of a lot of Facebook’s users would certainly lead to bad actors taking advantage of the data to perform social engineering attacks [or] hacking attempts," Gal told Insider.

  • "Individuals signing up to a reputable company like Facebook are trusting them with their data and Facebook [is] supposed to treat the data with utmost respect." he added. "Users having their personal information leaked is a huge breach of trust and should be handled accordingly."
  • Gal said Facebook can't do much to help affected users because their data has already been posted, but he said Facebook can notify the users so they can watch for scams or frauds.

Our thought bubble via Axios' Scott Rosenberg: Any information you provide to Facebook or post there is sooner or later likely to end up public, even if you try to keep it private or specifically restrict it to your friends.

  • That doesn't excuse Facebook from responsibility for protecting its users, but at this point in Facebook's history, it's a realistic assumption for any user's self-defense.

Editor's note: This story has been updated throughout with Facebook's comments and to clarify the data leaked was originally found in 2019.

Go deeper

Super typhoon Surigae explodes to Cat. 5 intensity

Super Typhoon Surigae seen on satellite imagery Saturday morning east of the Philippines. (CIRA/RAMMB)

Super Typhoon Surigae surged in intensity from a Category 1 storm on Friday to a beastly Category 5 monster on Saturday, with maximum sustained winds estimated at 190 mph with higher gusts.

Why it matters: This storm — known as Typhoon Bising in the Philippines — is just the latest of many tropical cyclones to undergo a process known as rapid intensification, a feat that studies show is becoming more common due to climate change. It weakened slightly, to the equivalent of a strong Category 4 storm, on Sunday.

3 hours ago - World

Biden adviser warns "there will be consequences" for Russia if Navalny dies

The Biden administration warned the Russian government "that there will be consequences" if jailed Russian opposition leader Alexei Navalny dies, National Security Adviser Jake Sullivan told CNN on Sunday.

The big picture: Sullivan also defended President Biden for not mentioning Navalny in a Thursday speech about Russia or in a Tuesday call with Russian President Vladimir Putin, saying the White House aims to deal with the issue "privately and through diplomatic channels."

3 killed, 2 wounded overnight in Kenosha bar shooting

Three people died and two were hospitalized with serious injuries after a gunman entered bar in Kenosha County, Wisconsin, the police department said in a statement on Sunday. Police responded to the shooting at around 12:42 a.m. and the suspect has not been found.

The big picture: The midnight shooting is the latest in a string of deadly mass shootings to hit the U.S. since March, fueling a debate in Washington about how to regulate the weapons.