An anonymous hacker claims to have breached CIA Director John Brennan's personal e-mail account and has posted documents online, including a list of e-mail addresses purportedly from Brennan's contact file.

The CIA said it referred the matter to the proper authorities, but would not comment further.

The hacker spoke to the New York Post, which described him in an article published on Sunday as "a stoner high school student", motivated by his opposition to US foreign policy and support for Palestinians. His Twitter account, @phphax, includes links to files that he said are Brennan's contact list, a log of phone calls by then-CIA deputy director Avril Haines, and other documents.

The Post said he didn't reveal his name or where he lived.

The hacker also claimed to have breached a Comcast account belonging to Homeland Security Secretary Jeh Johnson, and released personal information.

One document purporting to come from Brennan's AOL e-mail account contains a spreadsheet of people, including senior intelligence officials, along with their pension identification numbers, although the hacker redacted the numbers in the version he posted on Twitter. It's unclear why Brennan would have stored such a document in his private e-mail account. Based on the titles, the document appears to date from 2009 or before.

When people visit the White House and other secure facilities, they are required to supply their Social Security numbers. Brennan could have been forwarding a list of invitees to the White House when he was President Barack Obama's counterterrorism adviser, the job he held before he became CIA director in 2013.

Security experts advise people not to e-mail personal identification numbers, and some companies have software that automatically blocks an e-mail if it detects characters in the format of these numbers.

The hacker told the Post he had obtained a 47-page version of Brennan's application for a security clearance, known as an SF86. That document - millions of which were stolen from the federal personnel office last year - contains detailed information about past jobs, foreign contacts, finances and other sensitive personal details.

AP - AFP