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A UK data flaw let users access other companies' confidential info via the browser back button, prompting a system shutdown and investigation.
A security flaw in the UK’s Companies House WebFiling system, likely caused by an October 2025 software update, allowed logged-in users to access and potentially edit other companies’ confidential data using the browser’s back button.
The issue exposed sensitive details like directors’ dates of birth, addresses, and email addresses, though passwords and identity documents were not compromised.
Unauthorized filings may have been submitted, but existing filed documents were not altered.
The service was suspended on March 13 and restored by March 16 after being reported by tax professional Dan Neidle.
Companies House confirmed no evidence of large-scale or systematic access, stated no misuse has been confirmed, and is notifying all registered companies with guidance to review their records.
CEO Andy King apologized, emphasizing ongoing investigations and a commitment to transparency and security.
Una falla en los datos del Reino Unido permitió a los usuarios acceder a información confidencial de otras compañías a través del botón de retroceso del navegador, lo que provocó el cierre del sistema y la investigación.