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.

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

Published 17 March 2026