Wikimedia UK has been informed of a data security incident involving Beacon CRM, the platform we use to manage our contacts database.
Beacon detected the incident on 29 July 2026 and informed us on 3 August. Beacon’s current understanding is that compromised login details were used to access its systems and download copies of database backups. Their investigation is ongoing and, at this stage, we are not aware of the information having been published online or misused.
Beacon has secured its systems and is investigating the incident with external cyber-security specialists. It has also informed the relevant authorities.
Wikimedia UK has revoked and reconnected all Beacon integrations and security keys, including connections with forms, payment services and email platforms. We have also reported the incident to the Information Commissioner’s Office.
Following an internal risk assessment, we have decided that the information currently available and the type of data we hold do not warrant contacting all members, donors and other contacts directly. We do not store sensitive personal information, dates of birth, bank details or full payment-card details in Beacon. We have contacted our volunteers directly because their records may include information about their volunteering relationship with Wikimedia UK, as well as basic contact details.
There is no action that individuals need to take at this time. However as a general precaution, please remain alert to unexpected emails or messages claiming to be from Wikimedia UK or Beacon.
Beacon is continuing its investigation and strengthening its security measures. We will monitor developments closely and will contact individuals directly if further information identifies a specific risk or action they should take.
We recognise that incidents of this kind can be unsettling. Please be assured that we are doing everything within our control to protect your information and maintain the highest possible standards of data security.
Anyone with questions or concerns can contact us at: info@wikimedia.org.uk.