Software vulnerabilities, including an outdated operating system used by PBS.org, allowed the pirate band of hackers LulzSec to sail deep into the innards of the network’s main website over Memorial Day weekend. The marauders were retaliating for a Frontline documentary about WikiLeaks broadcast five days earlier. The hackers gave their assault a playful air, invading PBS NewsHour’s site and briefly posting a false report that the late rappers Tupac Shakur and Biggie Smalls were actually hanging out in New Zealand. Techs at PBS.org and at the NewsHour spent hours regaining control as the cyberattack exposed contact information for hundreds of staffers, stations, producers and press, as well as several internal PBS databases. Site managers “were playing cat and mouse” with LulzSec, said Travis Daub, NewsHour creative director.