People search Comcast data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 6 Comcast-linked incidents, with headline counts up to 35.8M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Comcast breach history matters
Comcast operates in Technology (United States). Across indexed rows, recurring themes include ransomware and extortion, credential theft and social engineering, third-party and supply-chain exposure, zero-day exploitation and malware. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2024 — 237k customers
Cataloged incident. Ransomware at FBCS debt collection agency. Names, addresses, SSNs, DOB, Comcast account numbers. Comcast notified 5 months later. FCC fined Comcast $1.5M for vendor oversight. Exposed categories include Names, Addresses, Social Security numbers, Dates of birth, Account numbers. BreachHistory cites approximately 237K+ affected records in this row. See the comcast2024 and canonical BreachHistory entry.
2023 — 35.8M Xfinity customers
Cataloged incident. Exploitation of critical Citrix vulnerability (CitrixBleed) in Xfinity systems. Unauthorized access October 16–19, discovered October 25. Usernames, hashed passwords, names, last 4 of SSN, DOB, security Q&A. Xfinity required password resets. Exposed categories include Usernames, hashed passwords, names, contact info, last 4 SSN, dates of birth, security questions and answers. BreachHistory cites approximately 35.8M+ affected records in this row. See the comcast-xfinity2023 and canonical BreachHistory entry.
2015 — 590k
Cataloged incident. Approximately 590k email addresses and passwords in plain text; 27k with home addresses. Exposed categories include Email addresses, Passwords, Addresses, Credentials. BreachHistory cites approximately 590K+ affected records in this row. See the comcast2015 and canonical BreachHistory entry.
2013 — — Comcast: The California Public Utilities Commission launched…
Cataloged incident. The California Public Utilities Commission launched an investigation into the unauthorized disclosure and publication of Comcast subscribers' unlisted names, telephone numbers and addresses to determine whether Comcast violated the laws, rules, and regulations of California.UPDATE (8/25/2014): An evidentiary hearing has been scheduled in this case for September 2014 to investigate whether or not Comcast broke the law. Exposed categories include Personal information. BreachHistory cites approximately 74K+ affected records in this row. See the comcast2013 and canonical BreachHistory entry.
2012 — — Comcast: A hacker or hackers posted email addresses,…
Cataloged incident. A hacker or hackers posted email addresses, plain-text passwords, and ID numbers online. Exposed categories include Personal information. BreachHistory cites approximately 294 affected records in this row. See the comcast2012 and canonical BreachHistory entry.
2009 — — Comcast: A list of over 8,000 Comcast user names and…
Cataloged incident. A list of over 8,000 Comcast user names and passwords were available to the public via Scribd for two months, before a Wilkes University professor discovered it over the weekend after doing a search for his identity online. Comcast is saying it looks like the result of a phishing scam and isn't an inside job, and that there are so many duplicate entries on the list that it's closer to 4,000 customers who were exposed. Exposed categories include Personal information. BreachHistory cites approximately 4K+ affected records in this row. See the comcast2009 and canonical BreachHistory entry.
Patterns and analysis
- Ransomware and extortion — appears across multiple Comcast catalog entries; prioritize controls that address this class of failure.
- Credential theft and social engineering — appears across multiple Comcast catalog entries; prioritize controls that address this class of failure.
- Third-party and supply-chain exposure — appears across multiple Comcast catalog entries; prioritize controls that address this class of failure.
- Zero-day exploitation and malware — appears across multiple Comcast catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Review OAuth app permissions and revoke unused third-party integrations.
- Step 5: Bookmark the Comcast company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/comcast · Latest: comcast2024.
Sources: BreachHistory catalog (6 rows for Comcast), company and regulator disclosures cited in individual breach records.