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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe City of Philadelphia said an unauthorized actor may have accessed certain city email accounts between May 26 and July 28, 2023. A filing with the Maine Attorney General identified 35,881 potentially affected individuals. The information varied by person and may have included names, addresses, birth dates, Social Security numbers, contact details, medical and treatment information, health-insurance data, medical billing or claims information, and limited financial information.
This was not a confirmed compromise of every Philadelphia government system or every city resident. The public record also does not establish that every listed type of information was exposed to every affected person, downloaded, or misused.
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What happened in Philadelphia’s 2023 email breach?
Philadelphia said it detected suspicious activity in its email environment on May 24, 2023. The city later determined that an unauthorized actor may have gained access to certain email accounts and information in those accounts from May 26 through July 28, 2023.
The incident involved city email accounts. The available notices do not say that all city systems were compromised, and they do not identify the attacker, the method of entry, the number of accounts involved, or whether information was exfiltrated. There is no public evidence in the cited records that this was a ransomware attack or that phishing caused it.
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Philadelphia’s detailed notice is available in its June 2024 privacy notice. The city’s earlier October 2023 preliminary notice described the privacy incident while the review was still underway.
How many people were affected?
The precise figure was 35,881 individuals, according to Philadelphia’s filing with the Maine Attorney General. Fifteen of those individuals were Maine residents.
“More than 35,000” is a rounded description of that number. It does not mean that 35,881 people were confirmed victims of identity theft, nor does it mean that all of them had the same information in the affected accounts. The city said the categories of information varied by individual.
What information may have been accessible?
The city’s notice used conditional language: certain information may have been accessible to an unauthorized actor. That is different from proving that every item was viewed, copied, or used.
- Identity and contact information: names, addresses, birth dates, and other contact information.
- Identity-theft information: Social Security numbers.
- Health information: diagnosis, treatment-related information, occupational-health information, health-insurance information, and medical billing or claims information.
- Limited financial information: certain claims information and other limited financial details.
The presence of health-related information is important. Someone may face medical-identity risks even if their bank accounts and credit cards show no suspicious activity. At the same time, the notices do not establish that every affected person’s medical records or Social Security number were available.
Philadelphia breach timeline
| Date | What happened |
|---|---|
| May 24, 2023 | The city said it became aware of suspicious activity in its email environment. The Maine filing lists this date as the breach date. |
| May 26–July 28, 2023 | An unauthorized actor may have accessed certain city email accounts and information in them. |
| July 28, 2023 | The Maine filing lists this as the discovery date. |
| Aug. 22, 2023 | The city said it learned that affected accounts could include protected health information. |
| Oct. 20, 2023 | Philadelphia published a general privacy-incident notice while its review continued. |
| July 8, 2024 | The city began sending individual notifications, according to the Maine filing and contemporaneous reporting. |
That timeline explains why the incident is often called the “May 2023 breach,” but the potential access period extended through July 28. Detection, the end of possible access, discovery, public notice, and individual notification were separate events.
Why did individual notification take until July 2024?
Philadelphia said it conducted a comprehensive review of potentially affected accounts using programmatic and manual analysis. It then had to validate the results, identify people connected to information in the accounts, and locate missing or updated mailing addresses.
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The October 2023 general notice meant the city had publicly disclosed a privacy incident before individualized letters were sent. However, people could not know from that broad notice whether their own information was involved until the later review and notification process was complete.
Who might have been affected?
There is no public list of affected people or simple public eligibility database in the cited notices. Philadelphia said it mailed notices to individuals it identified as affected and for whom it could obtain current addresses.
Potentially affected people may include individuals whose personal or protected health information appeared in city email accounts. That could include some city employees, patients, benefits recipients, or other people who exchanged information with city departments. It would be inaccurate to say that all Philadelphia residents, all city employees, or all participants in city health programs were affected.
Was there evidence of identity theft or fraud?
Available reporting said investigators found no evidence that affected people had suffered identity theft or fraud as a result of the intrusion. The Philadelphia Inquirer’s report and other coverage described that finding.
“No known evidence” is not the same as proof that misuse was impossible. Criminal use can be delayed, difficult to detect, or limited to information that does not immediately produce a bank alert. People who received a notification should continue monitoring the types of accounts and records identified in their letter.
What assistance did the city offer?
Philadelphia offered eligible affected individuals:
- 12 months of Kroll credit monitoring;
- fraud consultation; and
- identity-theft restoration services.
The Maine filing identifies those services and the July 8, 2024 start of individual notifications. If you received a letter, use the enrollment instructions and deadlines in that letter rather than relying on a third-party website.
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Kroll was the provider named for the city’s offer. Its general website is Kroll.com. A separate retail subscription is not automatically necessary, particularly if you qualify for the city-provided benefit. The research available for this article does not verify a current Kroll retail price or plan lineup.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What affected people should do now
If your Social Security number may have been involved
- Review your credit reports for unfamiliar accounts, inquiries, addresses, or collection activity.
- Consider placing a credit freeze with Equifax, Experian, and TransUnion. A freeze is free and helps block new creditors from opening accounts using your identity, but it does not monitor existing accounts.
- Watch for tax, employment, government-benefit, or debt-collection notices that you did not initiate.
- Be especially cautious with messages that use Philadelphia-related details to appear credible.
If medical or insurance information may have been involved
- Review explanations of benefits, insurance claims, provider bills, and medical records.
- Look for unfamiliar services, diagnoses, prescriptions, providers, or changes to your health-insurance information.
- Report suspicious activity to your insurer, medical provider, or the organization shown on the record.
If only contact information may have been involved
Expect a higher risk of targeted scam emails, calls, texts, and letters. Accurate personal details do not prove that a message is legitimate. Do not provide passwords, one-time codes, Social Security numbers, or payment information in response to an unsolicited contact.
For everyone who received a notice
- Review bank and financial-account statements.
- Change reused passwords and enable multifactor authentication where available.
- Keep the city’s letter and enrollment documentation.
- Contact the relevant bank, insurer, provider, or other institution immediately about suspicious activity.
A 12-month monitoring benefit is helpful but temporary. It does not replace long-term attention to credit, health-insurance, bank, and tax records.
If you never received a letter
Not receiving a notice does not prove either that you were affected or that you were not. The city’s process depended on identifying people connected to information in the accounts and locating mailing addresses.
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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Use only contact information from an official Philadelphia notice or a verified phila.gov page. Avoid “breach lookup” websites that ask for your Social Security number, payment details, or extensive personal information. Do not enroll through a link in an unexpected email unless you independently verify it.
What remains unknown
The cited official notices and reporting do not establish:
- who the unauthorized actor was;
- whether the entry involved phishing, stolen credentials, malware, password reuse, or another method;
- whether information was downloaded or otherwise exfiltrated;
- the exact number of affected email accounts;
- which specific department was the entry point; or
- that identity theft or fraud occurred as a result of the incident.
The 2023 email incident should also not be confused with Philadelphia’s July 2024 CrowdStrike-related technology outage, which the city described as an external technical issue rather than a cyberattack. See the city’s statement about that separate event.
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