Wikimedia Foundation Data Breach History
WebsiteAbout the Wikimedia Foundation The Wikimedia Foundation is the nonprofit organization that operates Wikipedia and the other Wikimedia free knowledge projects. Our vision is a world in which every single human can freely share in the sum of all knowledge. We believe that everyone has the potential to contribute something to our shared knowledge, and that everyone should be able to access that knowledge freely. We host Wikipedia and the Wikimedia projects, build software experiences for reading,
This page shows all data breaches of Wikimedia Foundation. View the complete breach timeline, records exposed, root causes, and AI breach risk score. BreachHistory tracks disclosed data breaches worldwide.
Data Breach Timeline — All Wikimedia Foundation Breaches
Wikimedia Foundation Data Breach Summary
This page tracks the Wikimedia Foundation data breach history and cybersecurity incidents affecting Wikimedia Foundation (United States). BreachHistory currently indexes 1 publicly disclosed or catalogued incident spanning 2026, with approximately an unknown number of records reported as exposed across all indexed events. These totals may include overlapping datasets or third-party estimates and should not be interpreted as unique affected users.
The Wikimedia Foundation breach timeline includes major data breaches, cyber attacks, data leaks, credential exposures, API abuse, and other security incidents. Each incident provides details on the estimated records exposed, attack method, affected data types, and supporting public sources. Currently, 0 incidents are company-confirmed.
Largest Wikimedia Foundation Data Breaches
Indexed Wikimedia Foundation incidents are listed below. Where a public count is unavailable, the catalog shows unknown records exposed. Open each page for attack method, data types, and sources.
- 2026 2026 Wikimedia Foundation — self-propagating on-wiki JavaScript worm; read-only lockdown — about Unknown records exposed · Catalogued incident
What Information Was Exposed?
Depending on the incident, exposed data may include email addresses, passwords, phone numbers, names, profile information, account identifiers, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.
Wikimedia Foundation Data Breach 2026
At the time of this update, BreachHistory catalogues 1 2026 incident related to Wikimedia Foundation. Most recent entry: 2026 Wikimedia Foundation — self-propagating on-wiki JavaScript worm; read-only lockdown. New incidents are added as official disclosures, regulatory filings, or credible cybersecurity reports become available.
What To Do If You Were Affected
If you believe your account may have been involved in a Wikimedia Foundation data breach, change any reused passwords, enable multi-factor authentication (MFA), monitor your account for suspicious activity, and be cautious of phishing emails or fake breach notifications.
This Wikimedia Foundation breach history is maintained by BreachHistory using public disclosures, regulatory filings, security research, and clearly labelled third-party claims. For the complete breach timeline, records exposed, incident details, and AI Breach Risk Score, explore the sections on this page.