Microsoft has fixed an error that exposed confidential emails to its Copilot artificial intelligence tool.

The company said the issue was addressed after it was identified. It stated that the error “did not provide anyone access to information they weren’t already authorised to see”. Microsoft did not give further details about how the problem occurred or how long it lasted.

Copilot is Microsoft’s AI-powered assistant, which is designed to help users with tasks such as drafting emails and summarising documents. The company said it had taken action to resolve the matter. No additional information has been provided about the number of users affected.