Facebook says almost 50 million of its users were left exposed by a security flaw.
The company said attackers were able to exploit a vulnerability in a feature known as “View As” to gain control of people’s accounts.
The breach was discovered on Tuesday, Facebook said, and it has informed police.
Users that had potentially been affected were prompted to re-log-in on Friday.
Tech Tent: Facebook’s family feud
Facebook hate speech glitch investigated by firm
The flaw has been fixed, wrote the firm’s vice-president of product management, Guy Rosen, adding all affected accounts had been reset, as well as another 40 million “as a precautionary step”.
Facebook – which saw its share price drop more than 3% on Friday – has more than two billion active monthly users.
The company has confirmed to reporters that the breach would allow hackers to log in to other accounts that use Facebook’s system, of which there are many.
This means other major sites, such as AirBnB and Tinder, may also be affected.

Who has been affected?
The firm would not say where in the world the 50 million users are, but it has informed Irish data regulators, where Facebook’s European subsidiary is based.
The company said the users prompted to log-in again did not have to change their passwords.
“Since we’ve only just started our investigation, we have yet to determine whether these accounts were misused or any information accessed. We also don’t know who’s behind these attacks or where they’re based. “
He added: “People’s privacy and security is incredibly important, and we’re sorry this happened.”
The company has confirmed that Facebook founder Mark Zuckerberg and its chief operating officer Sheryl Sandberg were among the 50 million accounts affected.

What is ‘View As’?
Facebook’s “View As” function is a privacy feature that allows people to see what their own profile looks to other users, making it clear what information is viewable to their friends, friends of friends, or the public.
Attackers found multiple bugs in this feature that “allowed them to steal Facebook access tokens, which they could then use to take over people’s accounts”, Mr Rosen explained.
“Access tokens are the equivalent of digital keys that keep people logged in to Facebook so they don’t need to re-enter their password every time they use the app,” he added.

What does this mean for Facebook?
The breach comes at a time when the firm is struggling to convince lawmakers in the US and beyond, that it is capable of protecting user data.
Facebook founder Mark Zuckerberg said on a conference call on Friday that the firm took security seriously, in the face of what he said were constant attacks by bad actors.
But Jeff Pollard, vice-president and principal analyst at Forrester, said the fact Facebook held so much data meant it should be prepared for such attacks.
“Attackers go where the data is, and that has made Facebook an obvious target,” he said. “The main concern here is that one feature of the platform allowed attackers to harvest the data of tens of millions of users.
“This indicates that Facebook needs to make limiting access to data a priority for users, APIs, and features.”
When asked by the BBC, Facebook was unable to say if the investigation would look into why the bugs were missed, or if anyone at the company would be held accountable for the breach.

36 Replies to “Facebook security breach: Up to 50m accounts attacked”

  1. essay writing websites
    admission college essay help
    buy essay online for cheap

  2. need help writing a essay
    english literature essay help
    essay writer reddit

  3. good essay writers
    essay on service to humanity
    buy cheap essay

  4. essay writing service best
    buy cheap essays
    do my essay for me cheap

  5. essay correction service
    essay writers cheap
    write my essay affordable

  6. persuasive essay helper
    admission college essay help

  7. custom essay services
    essay writing services review
    custom essay toronto

  8. online essay writers
    writing custom essays
    pay for someone to write my essay

  9. essay writing service legal
    cheap essay online
    us based essay writing service

  10. help me write a essay
    cheap essay writing service usa
    cheap custom essays

  11. Cheers. A good amount of data!
    college applications essays https://englishessayhelp.com/ i need help writing my personal statement

  12. Thank you, Lots of knowledge!
    writing an application essay essays writing services best resume writing services nyc

  13. Good material. With thanks!
    discount drugs online pharmacy legitimate online pharmacies canadian prescription drugs

  14. You actually mentioned it effectively.
    discount pharmacy online online medicine tablets shopping reputable canadian mail order pharmacies

  15. essay paper writing help
    essay writers review
    custom essay help

  16. You said it nicely..
    essay on going to college i cant write my essay which essay writing service is the best

  17. Thanks a lot. Lots of knowledge.
    i need help writing a descriptive essay https://essayssolution.com/ cheap essay writing service us

  18. Many thanks! A lot of tips.
    canadian pharmacy no prescription needed prescription drug online pharmacies of canada

  19. You actually expressed this superbly!
    how to write a narrative essay introduction https://theessayswriters.com/ help in assignment writing

  20. best cheap essay
    can t write my essay
    admission essay writing service

  21. Reliable write ups. With thanks.
    canadian drugs pharmacies online canada pharmacies northwest pharmacy canada

  22. You actually said it terrifically.
    college essay help pay you to write my essay reviews for essay writing services

  23. Regards! I appreciate it.
    ways to write an essay good essay writing website dissertation writing services

  24. Awesome posts. Many thanks!
    how to write reflection essay https://englishessayhelp.com/ professional essay writing service

  25. cheap essay writing service online
    write my essay reviews
    can i get someone to write my essay

  26. 1actions

  27. With thanks, Plenty of write ups.
    canadian pharmacy generic viagra canadian pharcharmy online no precipitation list of legitimate canadian pharmacies

  28. chat gay joven tu chat
    gay ruleete chat
    gay boy teen webcam chat

  29. Effectively spoken really. !
    prescription cost comparison most reliable canadian pharmacies prescription discount

  30. Kudos. I enjoy this!
    canada discount drug prescription discount aarp approved canadian online pharmacies

  31. Thank you, Quite a lot of data!
    pharmacy prescription costco online pharmacy canada pharmacy online

  32. Nicely put, With thanks!
    canadian drug store prescription drug drugstore online

  33. Regards. I like it!
    what to write about in college essay how to write a english essay online custom writing services

  34. You have made the point!
    writing my essay compare and contrast high school and college essay help in writing

  35. You actually suggested that effectively.
    honors college essay essaytyper how to find a ghostwriter

  36. You expressed it really well! writing essay service dissertation how to write an argument essay

Leave a Reply

Your email address will not be published.

You may use these <abbr title="HyperText Markup Language">HTML</abbr> tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <s> <strike> <strong>


%d bloggers like this: