Comcast Data Breach History

This page tracks the Comcast data breach history and cybersecurity incidents affecting Comcast (United States). BreachHistory currently indexes 6 publicly disclosed or catalogued incidents spanning 2009 through 2024, with approximately 36.7 million 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 Comcast 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 Comcast Data Breaches

The largest indexed incidents include the 2023 CitrixBleed — 35.8M Xfinity customers, the 2015 Email/password exposure — 590k, and the 2024 FBCS vendor ransomware — 237k customers, along with additional historical incidents involving exposed passwords, public databases, and large-scale data scraping. Record counts originating from threat actors or leak sites should be treated as estimates unless confirmed by Comcast or a regulator. Below is the list of large data breaches:

• 2023 2023 CitrixBleed — 35.8M Xfinity customers — about 35.8M records exposed · Catalogued incident
• 2015 2015 Email/password exposure — 590k — about 590.0K records exposed · Catalogued incident
• 2024 2024 FBCS vendor ransomware — 237k customers — about 237.0K records exposed · Catalogued incident
• 2013 2013 — Comcast: The California Public Utilities Commission launched… — about 74.0K records exposed · Catalogued incident
• 2009 2009 — Comcast: A list of over 8,000 Comcast user names and… — about 4.0K records exposed · Catalogued incident
• 2012 2012 — Comcast: A hacker or hackers posted email addresses,… — about 294 records exposed · Catalogued incident

What Information Was Exposed?

Depending on the incident, exposed data may include email addresses, passwords and login credentials, Social Security numbers and national IDs, names, physical addresses, bank account details, and other personal information (PII). The exact data varies between incidents, so review each breach page before assuming your information was affected.

Comcast Data Breach 2026

At the time of this update, no Comcast data breach has been catalogued for 2026. 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 Comcast 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 Comcast 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.