WASHINGTON — A State Department audit that found Hillary Clinton disregarded cybersecurity guidelines by using a private email server during her tenure as secretary of State renewed questions Wednesday about a controversy that has dogged her presidential campaign since it began more than a year ago.

The report from the inspector general, first obtained by the Associated Press and sent to members of Congress, found both she and previous secretaries of State poorly managed computer systems and cited “longstanding, systemic weaknesses” related to communications that preceded Clinton’s time in office.