The leading UK site for parents has had users data compromised by hackers then using 'Heartbleed' exploit.
Mumsnet sent an email to users, warning that the hackers may have passwords and personal messages before network administrators were able to fix the vulnerability.
The website has urged all users to change their passwords.
More top news
The victim, a man in his 40s, is being treated in hospital for "life-changing" injuries after the attack by two men who remain on the run.
Heavy security presence as 64,000 fans gather at the Stade de France stadium for the Six Nations rugby match between France and Italy.
Today's rain will clear into the North Sea tonight, but winds will stay strong, with showers feeding in to the north and west.