Users of microblogging website Twitter were warned of a new security bug that could redirect a browser to pornographic websites.
The vulnerability has affected thousands of Twitter profiles including the wife of the former UK prime minister Gordon Brown.
Reader’s of Sarah Brown’s Twitter profile have been redirected to a Japanese porm site.
While the flaw is not dangerous at present, Sophos advised Twitter users to access the site via third party tools until the error code has been blocked.
Twitter has yet to respond to the attack on its website.