Correspondence

Email to registered companies about the WebFiling security issue

Official email from Companies House to all registered email addresses of companies registered in the UK, about a security issue that affected the WebFiling service.

• From: Companies House
• Published: 17 March 2026

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Email to registered companies about the WebFiling security issue

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Details

Companies House is contacting every company’s registered email address between Tuesday 17 March and Thursday 19 March, about a security issue identified with the WebFiling service on Friday 13 March 2026.

This is a copy of the email which explains what happened, how to check your details and what steps to take if you have any concerns.

Emails will come from companies.house@notifications.service.gov.uk.

For more information, read the statement from the Chief Executive of Companies House on the WebFiling security issue.

Published 17 March 2026