The Isle of Wight Council has referred itself to the data privacy watchdog after it erroneously emailed out the personal details of 90 Island families.
The local authority has apologised for the breach.
An email, which contained an attachment, was sent to around 80 email addresses on Friday (18).
Parents of Year 11 elective home education students received the information, the council said.
An Isle of Wight Council spokesperson said:
“In line with the council’s protocols, the email was recalled twenty minutes after sending and a follow-up email was also sent to all recipients asking them to delete the original email without opening it.
“The email was sent to around eighty addresses and the council would like to apologise to all of the families listed in the document that was incorrectly attached and would be grateful for their support in deleting the original email sent in error."
The council said it has notified the Information Commissioner’s Office, which is expected to look into the matter.