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Footage obtained by POLITICO shows the journalist, Daniël Verlaan of RTL Nieuws, appearing in a large window at the top of the videoconference screen, dressed in a black T-shirt, grinning and waving to the ministers.
Dutch Prime Minister Mark Rutte warned his Cabinet on Friday (Nov 20) to beef up online security after a journalist logged into a confidential European Union videoconference using information posted on a minister's Twitter account.
RTL reported that Verlaan had been able to gain access to the meeting because "the Twitter account of Minister Ank Bijleveld briefly contained a photo with the login address and part of the PIN code".
The video published by the broadcaster shows EU's Josep Borrell asking "Who are you?" and noting the call has been "intercepted". In his own Twitter post, Verlaan said the code could be guessed "with a few tries".
"You know that you have been jumping into a secret conference?"
'I am a journalist from the Netherlands, ' Verlaan said. "I'm sorry for interrupting your conference", a smiling Verlaan replied. "I'll be leaving here".
'You know it's a criminal offence, huh?' Mr Borrell replied. "You better sign off quickly before the police arrives".
The Dutch tech reporter made a decision to sign off then, saying "bye bye" to the conference before exiting the call.
Mr Borrell apologises to the members even as many appear amused at the situation.
The meeting was subsequently stopped because the confidential nature could no longer be guaranteed.
"In a number of attempts, RTL Nieuws succeeded in guessing the PIN code of the secret consultation, because five of the six digits of the pin code were visible in the photo", the news outlet said.
"This shows once again that ministers need to realize how careful you have to be with Twitter", Rutte said in the Hague.