A January 4 CIA report addressed Baghdad's Scud missile and delivery system, while forthcoming reports are expected to revise pre-war estimates of Iraq's biological and nuclear capabilities.
The intelligence official, who asked not to be named, said the latest report was not considered a high-level document for review by US President George W. Bush.
"This matches up what the assessment was before the war and what the assessment is after the war," the official said. "It takes into account post-war information that was, by definition, not available earlier."
US intelligence claims that Iraq possessed large stockpiles of chemical and biological weapons and was attempting to acquire nuclear capability formed a main justification for the 2003 invasion.
Former CIA Director George Tenet, who resigned last July, told Bush that finding WMD in Iraq would be a "slam dunk" according to journalist Bob Woodward's book "Plan of Attack."
But no WMD have been found in Iraq and US weapons inspector Charles Duelfer is expected this month to issue a final addendum to his September report concluding that pre-war Iraq had no such stockpiles.
"The CIA has finally admitted that its WMD estimates were wrong," Rep. Jane Harman of California, ranking Democrat on the House intelligence committee, said in a statement.
She also called on CIA officials to conduct a vigorous review of intelligence on Iran and North Korea, "where active WMD programs are known to exist."