A Russian hacker nicknamed 'HASH' gained access to a BBC server over the Christmas period, and attempted to sell it to other cyber criminals.
US firm Hold Security spotted the hacker advertising the exploit on an underground cybercrime forum.
BBC reporters had historically used the server as a way to send in their own material, and more recently the facility has been used to allow advertisers to send in media files for use on the BBC Worldwide Channels.
A spokesman for the BBC said: "We do not comment on security issues."
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