Businesses urged to check records after Companies House WebFiling data glitch
The issue was identified on Friday, March 13 and the service was taken offline while the problem was investigated and fixed.
WebFiling has been independently tested and has been back online since 9am on Monday, March 16.
A Companies House spokesperson said: “The issue arose from a system update in October 2025 and was not the result of a malicious attempt to attack our systems. It is not a cyber-attack.
“The issue could only have been exploited by a logged-in user performing a specific set of actions.”
The investigation found that it was technically possible for a logged-in registered user to see certain data not normally published on the public register:
• the day of the date of birth for directors and PSCs
• residential address for directors and PSCs
• company registered email address
It was also possible to post updates to any information without consent. For example, new accounts or changes of director.
Companies House says:
• You do not need to reset your WebFiling password
• No identity verification data, such as passport information or personal codes, was accessed
• No existing filed documents could have been altered
And if you have applied to protect your personal details under the Companies Act 2006, your information was not affected by this issue.
What you should do now
Companies House says it is contacting businesses proactively on a “precautionary basis” to make them aware of this issue.
It says: “At this stage, we have no confirmed reports of any data having been accessed or changed without permission, and we believe the issue could not have been used to extract data in large volumes.
“However, as a precaution, please check your registered details and filing history to make sure everything looks correct.”
You can do this in WebFiling and on the Find and update company information service: https://find-and-update.company-information.service.gov.uk/
If anything seems incorrect or unexpected, please contact Companies House at enquiries@companieshouse.gov.uk using ‘WebFiling issue’ in the subject heading.
Include as much detail as you can about your concern, including your company name and number. The more information you can give them to support their investigation – the easier it will be to resolve the issue for you.
Further recommendations
Companies House also recommends signing up to its free Follow service: https://find-and-update.company-information.service.gov.uk/
Follow sends you an instant email alert whenever a document is filed with them for any company you choose to follow – including your own.
It is described as “a simple way” to stay informed and spot anything unexpected as soon as it happens. You can sign up through the Find and update company information service and then select ‘Follow this company’ on your company’s page.
Next steps
Companies House has reported this incident to the Information Commissioner’s Office (ICO). The organisation is analysing its data, and says: “If we find evidence that anyone has accessed or changed another company’s details without authorisation, we will take firm action. We will keep you updated as our investigation progresses.”
The organisation has also issued an apology, saying: “We recognise that this incident may have caused concern, and we are sorry for that. Companies House takes its responsibility to protect your data extremely seriously, and we are committed to doing everything we can to support those affected and to maintaining your trust in our services.”

