ROYAL OAK, Mich. (AP) — About 2,700 people were able to use an online scheduling vulnerability to register out of turn for COVID-19 vaccinations, according to a Detroit-area health care system.

Beaumont Health said it has determined a user publicly shared an unauthorized pathway for scheduling.

“This allowed 2,700 people to ‘cut in line,’” the eight-hospital health system said Sunday in a release. “Beaumont is canceling all the appointments that used the unauthorized pathway.”

“These appointments violate the ethical distribution framework Beaumont created based upon the state of Michigan’s mandatory vaccine guidelines,” said Hans Keil, Beaumont Health senior vice president and chief information officer.

The issue will not affect properly scheduled vaccine appointments, it added.

Beaumont’s information technology team detected and shut down unusual activity Saturday on its Epic electronic medical record system. Personal medical records were not compromised, and users were not able to access hospital records, Beaumont said.

Beaumont has reported other recent security issues, the Detroit News said. In July, it announced that an “unauthorized third party” had gained access to employee email accounts that contained personal information concerning up to 6,000 patients. In April, it reported a data breach the previous year that officials said could have exposed the personal information of up to 112,000 people.