(CNN) -- A publicist for Jennifer Lawrence slammed the appearance of nude photographs of the Oscar-winning actress online Sunday as a "flagrant violation of privacy." 
 
 "The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence," the publicist said in a written statement. 
 
 Posts on 4chan, Reddit, Twitter and Tumblr claim to include nude photographs of Lawrence, who won an Academy Award last year for her role in "Silver Linings Playbook." 
 
 Twitter posts on verified accounts of several other celebrities Sunday also reported hacks. 
 
 "To those of you looking at photos I took with my husband years ago in the privacy of our home, hope you feel great about yourselves," actress Mary E. Winstead wrote. 
 
 "Knowing those photos were deleted long ago, I can only imagine the creepy effort that went into this. Feeling for everyone who got hacked." 
 
 Some celebrities claimed the photos were doctored. 
 
 An individual close to singer Ariana Grande told CNN photos claiming to show her are "completely fake." 
 
 And actress Victoria Justice said pictures purporting to be her are fake. 
 
 This isn't the first time celebrities have accused hackers of stealing risque photos. 
 
 A judge sentenced Christopher Chaney of Florida to 10 years in federal prison in 2012 for stealing nude photos, scripts and personal information from the e-mail accounts of 50 entertainment industry figures, including movie stars Scarlett Johansson and Mila Kunis and singer Christina Aguilera. 
 
 The first real case of a celebrity hacking attack was in 2005 when hackers logged into Paris Hilton's phone and stole photos of the reality star, Mikko Hypponen, chief research officer at computer security company F-Secure told CNN in 2011. Those hackers reportedly were able to break into Hilton's phone by correctly guessing the not-so-secret answer to her security question, which was "tinkerbell," the name of her pet Chihuahua. 
 
 CNN's Rachel Wells, Dave Alsup, Alan Duke and John D. Sutter contributed to this report. ||||| Over the weekend, there's been a slew of images released showing celebrities in varying states of undress. Now, it appears that a flaw in iCloud could be responsible for the images making their way online. 
 
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 The Next Web reports that a Python script has appeared on Github that "appears to have allowed malicious users to 'brute force' a target account's password on Apple's iCloud." Based on a vulnerability in the Find my iPhone service, the software was able to repeatedly guess passwords very quickly in an attempt to find the right one. Usually multiple guesses lock accounts down, but the flaw in Find my iPhone meant that didn't happen. 
 
 The software sat on Github for two days, before appearing on Hacker News and then swiftly being patched by Apple today at 3:20 am PT. The Next Web has since tried using the tool, which now quickly locks accounts—suggesting that it does indeed brute forces passwords but has now been patched. 
 
 It's unclear when the hole first appeared and how long people have been using it. The fact that the hacker who originally leaked the celeb images claimed they were retrieved from iCloud suggests that it could have been this hole being used. That remains somewhat speculative, though: The Independent reports that Apple has, unsurprisingly, "refused to comment" on any security flaw in iCloud today. [The Next Web] ||||| Jennifer Lawrence One of Dozens Targeted in Nude Photos Leak 
 
 Jennifer Lawrence -- One of Dozens Targeted in Nude Photos Leak 
 
 EXCLUSIVE 
 
 Photos purporting to show a nudeare making their way around on the Internet as part of what appears to be a massive celebrity hacking campaign.The photos claiming to be of Lawrence were taken in various locations -- some of them appear to be taken in a dressing room, while others are more intimate. Some of the photos show the woman who is allegedly Lawrence taking the photos herself, while others appear to be taken by someone else.A few of the photos show what appears to be Lawrence in various bathing suits ... but others are fully nude.There are a ton of other partially nude photos of celebrities posted today ... the alleged victims include, andLawrence's spokespeople tell TMZ, "This is a flagrant violation of privacy. The authorities have been contacted and will prosecute anyone who posts the stolen photos of Jennifer Lawrence."We're reaching out to the reps for the women involved. So far, no word back ...denied the photos going around claiming to be her are authentic, writing on Twitter, "These so called nudes of me are FAKE people. Let me nip this in the bud right now. *pun intended*", also part of the leak, confirmed the photos of her were real, writing, "Knowing those photos were deleted long ago, I can only imagine the creepy effort that went into this. Feeling for everyone who got hacked. To those of you looking at photos I took with my husband years ago in the privacy of our home, hope you feel great about yourselves."tweeted late Sunday night, saying the photos claiming to be of her are fake, writing, "hell nah.... praying for the people who believed that was me lmaoo... my petite ass is much cuter than that."'s attorney released a statement saying, "This is obviously an outrageous violation of our client Kate Upton's privacy. We intend to pursue anyone disseminating or duplicating these illegally obtained images to the fullest extent possible." ||||| Tweet with a location 
 
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– A huge number of nude photos of celebrities were leaked online over the weekend, but it's not clear just how big the leak is. Some celebs say the photos are fakes, while at least one has confirmed their authenticity and threatened legal action, TMZ reports. "This is a flagrant violation of privacy. The authorities have been contacted and will prosecute anyone who posts the stolen photos," a rep for Jennifer Lawrence said in a statement. The leak first surfaced on the 4chan website, BuzzFeed reports; a "master list" of hacked celebrities includes Kirsten Dunst, Kate Upton, Kim Kardashian, Rihanna, and dozens more. "To those of you looking at photos I took with my husband years ago in the privacy of our home, hope you feel great about yourselves," tweeted actress Mary E. Winstead. "Knowing those photos were deleted long ago, I can only imagine the creepy effort that went into this. Feeling for everyone who got hacked." Stars like Victoria Justice and Ariana Grande are among those saying the photos appearing online have been doctored, CNN reports. Meanwhile, Gizmodo thinks that hackers could have exploited an iCloud security flaw to get the images. In 2012, hacker Christopher Chaney received a 10-year sentence for stealing nude photos of Scarlett Johansson and dozens of other women.