The word 'password' is pictured on a computer screen in this picture illustration taken in BerlinBy Jim Finkle and Joseph Menn BOSTON/SAN FRANCISCO (Reuters) – Activist hackers linked to the collective known as Anonymous have secretly accessed U.S. executive computer systems in a couple of agencies and stolen sensitive data in a campaign that began almost a 12 months in the past, the FBI warned this week. The hackers exploited a flaw in Adobe Methods Inc’s instrument to launch a rash of electronic smash-ins that started closing December, then left “back doors” to return to a number of the machines as just lately as final month, the Federal Bureau of Investigation said in a memo considered by Reuters. The memo, distributed on Thursday, described the attacks as “a in style problem that should be addressed.” It stated the breach affected the U.S. Military, Department of Vitality, Division of Health and Human Services and products, and possibly many more businesses. Investigators are nonetheless gathering data on the scope of the cyber campaign, which the authorities believe is continuous.