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
Prisons hit record highs for the number of inmates released in error, as well as for the number of assaults on both prisoners and staff.
One person was killed and several others injured when a fairground ride malfunctioned and broke apart mid-swing.
The government has faced questions as to why the expert analysis of one of the central issues of Brexit was not ordered sooner.