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BreachRecord

Comcast Cable Communications LLC Data Breach (December 2023): What Was Exposed and What To Do

Last updated Oct 20, 2026 · Based on 2 official filings · See sources

According to the notice filed with the Washington State Attorney General on Dec 18, 2023, Comcast Cable Communications LLC reported a data breach. It was also reported to the California Attorney General. People affected: At least 3,100,608 people in 1 state (Washington residents, Washington State Attorney General filing).

Key facts

From 2 official filings
Organization
Comcast Cable Communications LLC
Source: Washington State Attorney General, filed Dec 18, 2023
People affected
At least 3,100,608
At least 3,100,608 people in 1 state (Washington residents, Washington State Attorney General filing)
Source: Washington AG, Dec 18, 2023
Incident dates
Oct 16, 2023 – Oct 19, 2023
Source: Washington State Attorney General, filed Dec 18, 2023
Discovered Oct 25, 2023
Source: Washington State Attorney General, filed Dec 18, 2023
Notice dates
First filed Dec 18, 2023
Source: Washington State Attorney General, filed Dec 18, 2023
Information exposed
  • Social Security number
  • Date of birth
  • Username and password
  • Name
Source: Washington AG, Dec 18, 2023
Filed with
Free credit monitoring
No offer is stated in the filings we have. Check your letter.

What to do now

Steps chosen from the information listed in the official filings. Your own letter may list more.

  1. A credit freeze stops new credit accounts being opened in your name. It is free by law and you can lift it when you need credit: Equifax, Experian and TransUnion.

  2. An IP PIN stops someone else filing a tax return with your Social Security number. Get one from the IRS at irs.gov.

  3. Change the password for the affected account and for any other account where you used the same password. Use a different password for every account (a password manager can help) and turn on two-step verification where it is offered.

  4. Scammers often contact people after a breach, pretending to be the organization, a bank or a government agency. Do not give your Social Security number, passwords or codes to anyone who contacts you first.

  5. You can get free credit reports from all three bureaus at AnnualCreditReport.com, the official site.

  6. The Federal Trade Commission's IdentityTheft.gov gives you a personal recovery plan.

Is the letter real?

The agency published an official copy of the notice. Compare your letter with it:

Letters usually list a phone number for questions. Before calling, check that it matches the number in the official copy linked above.

Never give your Social Security number, bank details or passwords to someone who contacts you first.

Timeline

  1. Incident began (earliest date reported) source
  2. Incident ended (latest date reported) source
  3. Organization discovered the incident source
  4. Reported to Washington AG and California AG source

Sources

  1. Washington State Attorney General Notice filed Dec 18, 2023
    Filed as “Comcast Cable Communications LLC” · 3,100,608 Washington residents · Official copy of the letter
    The link opens the Attorney General's list of notices.
  2. California Attorney General Notice filed Dec 18, 2023
    Filed as “Comcast Cable Communications LLC”

Last updated Oct 20, 2026. Our summaries are written in our own words from the official filings above. Spotted an error? Report a correction.