A number of pages on the NBC.com website were defaced Sunday with a reference to Guy Fawkes Day and a claim that user names and passwords for the site had been compromised. The defacement appears to be the work of one hacker who exploited a security flaw in the community software used to manage user's accounts.

The defacement included part of a traditional Guy Fawkes Day poem ("Remember, remember, the fifth of November / The Gunpowder Treason and plot"). It affected NBC's homepage, its video homepage, and the site for Saturday Night Live among others. As of 3:00pm EST today, the site had been restored—though some pages were re-defaced as NBC attempted to repair the damage over the course of the day. (With all the issues, NBC has disabled user logins.) The defacement also included a claim user accounts and passwords had been compromised ("User info exposed, passwords dumped").