A former security chief for Twitter has turned whistleblower and testified that the company misled users and US regulators about gaps in its security.
Peiter Zatko also claimed that Twitter underestimated how many fake and spam accounts are on its platform.
The accusations could affect a legal battle between Twitter and billionaire Elon Musk, who is trying to cancel his $44bn (£37bn) deal to buy the company.
Twitter says Mr Zatko’s allegations are inaccurate and inconsistent.
It says he was sacked in January for ineffective leadership and poor performance.
In Mr Zatko’s damning revelations revealed by The Washington Post, accused Twitter of failing to maintain stringent security practices and “lying about bots to Elon Musk”.
He filed his complaint with the Securities and Exchange Commission in July. The BBC has seen a redacted copy of the complaint shared via CBS news.
In it, Mr Zatko also criticised the way in which Twitter handled sensitive information and claimed that it has failed to accurately report some of these matters to US regulators.
Twitter has faced a number of high profile hacks with Barack Obama, Joe Biden and Kanya West all targeted.
Among his concerns Mr Zatko alleges that Twitter suffered from an usually high rate of security incidents – “approximately one security incident each week serious enough that Twitter was required to report it to regulators”.
He said that so-called insider threats – security risks posed by people with malicious intent from within the company – went “virtually unmonitored”.
The former security chief revealed his concern about how Twitter handled data, alleging that too many employees had access to sensitive systems and user data.
He worried that the company had no workable disaster recovery plan, and claimed that in the past, Twitter had failed to properly delete the data of people who cancelled their accounts.
Why did Elon Musk get cold feet on Twitter?
On fake and spam accounts, he said that “deliberate ignorance was the norm” at the tech company, and accused Twitter executives of having little incentive to accurately identify how many there really are on its platform.
However in the view of The Washington Post, he “provides little hard evidence” to back up these assertions.
Nevertheless, Elon Musk’s lawyers have jumped on the comments. His legal team are currently trying to get the Tesla boss out of the deal, by arguing that Twitter has no way of verifying how many of its 229 million daily active users were actually human.
Following the publication of Mr Zatko’s revelations, Mr Musk tweeted screenshots of The Washington Post’s story, and tweeted an image carrying the phrase “give a little whistle”.
Mr Zatko’s lawyer told CNN that his client started the whistleblowing process before the takeover bid became public, and had not made contact with Elon Musk.
However one of Elon Musk’s lawyers, Alex Spiro, said that Mr Zatko had been subpoenaed to be a potential witness.
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