JBS says he did “significant progress” to resolve the cyberattack impacting operations and “large majority” of its meat factories will be operational on Wednesday. (Michael Hirtzer / Bloomberg)

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TikTok, the short-video sensation that’s among the world’s most downloaded apps, is coming under increased scrutiny about its data security as it guards the personal information of over a billion users.

On Monday, several cybersecurity analysts tweeted about the discovery of what was purportedly a breach of an insecure server that allowed access to TikTok’s storage, which they believe contained personal user data. Only days earlier, Microsoft Corp. said it had found a “high-severity vulnerability” in TikTok’s Android application, “which would have allowed attackers to compromise users’ accounts with a single click.”

ByteDance Ltd.’s TikTok surpassed a billion monthly users a year ago and now ranks as many young people’s favorite app. That makes it an enticing target for hackers who may seek to hijack popular accounts or resell sensitive information. It was identified as a privacy threat by the Trump administration in 2020 and nearly banned because of concern about potential links between its Beijing-based parent company and the Chinese government.

TikTok said the claims of a breach discovered over the weekend were incorrect. “Our security team investigated this statement and determined that the code in question is completely unrelated to TikTok’s backend source code,” a spokesperson said.

Troy Hunt, an Australian web security consultant, went through some of the data samples listed in the leaked files and found matches between user profiles and videos posted under those IDs. But some details included in the leak were “publicly accessible data that could have been constructed without breach.”

“This is so far pretty inconclusive; some data matches production info, albeit publicly accessible info. Some data is junk, but it could be non-production or test data,” he posted on Twitter. “It’s a bit of a mixed bag so far.”

The vulnerability identified by Microsoft is a narrower issue that could have affected mobile phones running Android. It may have allowed attackers to access and modify “TikTok profiles and sensitive information, such as by publicizing private videos, sending messages and uploading videos on behalf of users,” wrote Dimitrios Valsamaras from the Microsoft 365 Defender Research Team.

A TikTok spokesperson said the company had responded quickly to Microsoft’s findings and fixed the security flaw, which was found “in some older versions of the Android app.”

However inconclusive or small the issues may be, there will be intense focus on TikTok and its parent firm at a time when the US may step up its measures against businesses with links to China. In June, nine US senators wrote a public letter to TikTok’s chief executive officer asking him to explain alleged security breaches.

President Joe Biden is expected to sign an executive order that would restrict US investment in Chinese tech companies and separate action targeting TikTok is a possibility, with the administration paying close attention to whether the Chinese government has access to American customer data. The company has told US lawmakers that it has taken steps to protect that data through a contract with Oracle Corp.

“There’s a lot of attention on the way TikTok operates and there’s a big gap between how it operates and how it says it operates,” said Robert Potter, co-CEO of Australian-US cybersecurity firm Internet 2.0 Inc.

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