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BreachRecord

The University of Pennsylvania Data Breach (December 2025): What Was Exposed and What To Do

Last updated Oct 20, 2026 · Based on 3 official filings · See sources

According to the notice filed with the Washington State Attorney General on Dec 1, 2025, The University of Pennsylvania reported a data breach. It was also reported to the California Attorney General and the Texas Attorney General. People affected: 442,500 people (official total in the Texas Attorney General filing, filed Dec 3, 2025).

Key facts

From 3 official filings
Organization
The University of Pennsylvania
Source: Washington State Attorney General, filed Dec 1, 2025
People affected
442,500
Official total in the Texas Attorney General filing, filed Dec 3, 2025
Source: Texas Attorney General, filed Dec 3, 2025
Incident dates
Aug 9, 2025 – Aug 11, 2025
Source: Washington State Attorney General, filed Dec 1, 2025
Discovered Sep 29, 2025
Source: Washington State Attorney General, filed Dec 1, 2025
Notice dates
First filed Dec 1, 2025; latest filing Dec 3, 2025
Source: Washington State Attorney General, filed Dec 1, 2025
Information exposed
  • Social Security number
  • Financial account number
  • Name
  • Address
Sources: Washington AG, Dec 1, 2025; Texas AG, Dec 3, 2025
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. Review recent transactions, ask about account alerts, and ask whether a new account number is recommended.

  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?

Letters usually list a phone number for questions. We could not find an official copy of the letter, so check that the organization named in your letter appears in the official filings listed below before you call.

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
  5. Reported to Texas AG source

Sources

  1. Washington State Attorney General Notice filed Dec 1, 2025
    Filed as “The University of Pennsylvania” · 6,413 Washington residents
    The link opens the Attorney General's list of notices.
  2. California Attorney General Notice filed Dec 1, 2025
    Filed as “The University of Pennsylvania”
  3. Texas Attorney General Notice filed Dec 3, 2025
    Filed as “The University of Pennsylvania” · 11,455 Texas residents · total 442,500
    The link opens the agency's list; search it for the organization name.

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