Pentagon says cyber breach of travel records may affect up to 30,000 Defense Department employees

  • A U.S. official familiar with the matter says the breach could have affected as many as 30,000 workers
  • The official says no classified information was compromised
  • The Pentagon says a department cyber team informed leaders about the breach on Oct. 4.
The American flag hangs over the west side of the Pentagon to mark the 17th anniversary of the September 11, 2001 attacks.
Amanda Macias } CNBC
The American flag hangs over the west side of the Pentagon to mark the 17th anniversary of the September 11, 2001 attacks.

The Pentagon says there has been a cyber breach of Defence Department travel records that compromised the personal information and credit card data of U.S. military and civilian personnel.

A U.S. official familiar with the matter says the breach could have affected as many as 30,000 workers, but that number may grow as the investigation continues. The breach could have happened some months ago but was only recently discovered.

The official says no classified information was compromised. The official spoke on condition of anonymity because the breach is under investigation.

The Pentagon says a department cyber team informed leaders about the breach on Oct. 4.

Lt. Col. Joseph Buccino, a Pentagon spokesman, said the department is still gathering information on the size and scope of the hack and who did it.