LONDON — A notorious Russian hacker offered to sell access to a secret BBC computer server on Christmas Day.

The hacker, known by the monikers “HASH” and “Rev0lver,” placed notices on underground cyber-crime forums stating that it had hacked a BBC server, ftp.bbc.co.uk, and would provide access to those willing to pay, according to Reuters news agency.

The BBC declined to discuss the incident, but the BBC’s security team managed to secure the site on Saturday, according to a source.

Hold Security, a cybersecurity firm in Milwaukee that monitors cyber-crime forums, was the first to raise the alarm when “HASH” began to display stolen BBC files online, and offered access to the site for a price.