More than half-a-million people who bought access to phone surveillance and social media snooping apps had their email address and partial payment card numbers published online.

The two-line letter to the CIA's director is the latest warning in recent years from a long-serving Democratic senator with knowledge of secret government programs and intelligence operations.

The ransomware attack at Conduent allowed hackers to steal a "significant number of individuals’ personal information" from the govtech giant's systems. Conduent handles personal and health data of more than 100 million people across America.