According to a confidential Yale report obtained by the Washington Post, Princeton staffers logged onto Bush's online acceptance notice four times in one afternoon.
The online acceptance notice for Ara Parseghian, the grandson of the Notre Dame University football coach, also was accessed by Princeton, according to the report.
Yale's Web site allowed undergraduate applicants to see if they were accepted to the university by using their Social Security numbers and birth dates.
Princeton, which looked at the admissions decisions for 11 Yale applicants, gained access to the Web site using information from students who had applied to both schools.
Stephen LeMenager, Princeton's associate dean and director of admission, has acknowledged improperly entering the site, but said he checked it simply to test its security.
LeMenager has been placed on paid administrative leave, and is the only person Princeton has cited in the case so far, Princeton spokeswoman Marilyn Marks said Saturday.
An attorney hired by Princeton arrived on campus Friday to begin an inquiry into whether other staffers were involved.
Marks would not comment on the Washington Post report.
"I cannot comment about individual students or applications," she said. "I know that we do intend to reach out to the (affected) students and I believe that that process has started."
Yale officials did not immediately return calls for comment Saturday.
On Thursday, Yale notified the FBI about 18 unauthorized log-ins to their Web site that were traced back to computers at Princeton, including computers in the admissions office.
The FBI was investigating whether there was a federal violation.
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