Marriott Starwood Data Breach: 7 Steps To Protect Yourself

Marriott International disclosed that the guest reservation database for its Starwood-branded hotels had been compromised for years, exposing personal information for hundreds of millions of travelers worldwide. For consumers, this incident is a reminder that large companies can suffer long-running cyberattacks and that individuals need practical strategies to reduce the harm when it happens.

This guide explains what is known about the Marriott Starwood data breach, why it matters, and the specific steps you can take now to help protect your finances and identity.

1. Overview of the Marriott Starwood Breach

Marriott acquired Starwood Hotels in 2016, inheriting Starwood’s guest reservation system. Years later, Marriott announced that this system had been compromised by hackers since 2014. According to Marriott and government investigations, the attackers had ongoing, unauthorized access to the Starwood network and copied massive amounts of guest data before the incident was discovered.

1.1 Who could be affected?

Marriott reported that up to approximately 500 million guests who made reservations at Starwood properties over several years were potentially affected. Starwood brands included:

• W Hotels
• St. Regis
• Sheraton Hotels & Resorts
• Westin Hotels & Resorts
• Le Méridien Hotels & Resorts
• Other Starwood-branded hotels and timeshare properties

If you stayed at one of these properties and made a reservation on or before September 10, 2018, your information could have been included in the compromised database.

1.2 What information was exposed?

According to Marriott’s disclosures and subsequent regulatory findings, the attackers accessed a wide range of personal information from the Starwood reservation database. For many guests, the data involved included some combination of:

• Full name
• Mailing address
• Phone number
• Email address
• Date of birth
• Gender
• Passport number
• Loyalty program account information (e.g., Starwood Preferred Guest)
• Arrival and departure dates and other reservation details

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For some guests, payment card numbers and expiration dates were also involved. Regulatory complaints later noted that millions of passport numbers and other sensitive identifiers were exposed, and some were not adequately encrypted.

2. Why the Marriott Breach Matters for Consumers

Data breaches involving hotels, retailers, and other service providers are increasingly common. What makes the Marriott Starwood incident particularly serious is the volume of data, the variety of personal identifiers involved, and how long the attackers remained in the system before discovery.

2.1 Long-term exposure increases risk

Security investigations found that unauthorized access to Starwood systems began as early as 2014 and went undetected for years. The longer attackers remain inside a network:

• The more data they can collect.
• The deeper they can move across systems and applications.
• The more time they have to copy, encrypt, or exfiltrate sensitive information.

For consumers, this means that criminals can assemble detailed profiles over time, combining travel history, contact details, and identity documents to attempt broader fraud.

2.2 Highly sensitive identifiers were involved

Government enforcement actions emphasize that millions of passport numbers and large volumes of personal data were exposed. Unlike payment cards, which can be reissued, passports and some identity numbers are often harder to change and may remain valuable to criminals for years. This increases the need for long-term monitoring and vigilance.

2.3 Regulatory response underscores the seriousness

Regulators in the United States and other jurisdictions investigated the Marriott breach and took enforcement actions focused on the company’s security practices. The U.S. Federal Trade Commission (FTC), for example, alleged that Marriott and Starwood failed to implement reasonable safeguards, including strong password controls, network segmentation, and adequate logging and monitoring. As part of a proposed settlement, Marriott must implement enhanced security controls and maintain a comprehensive information security program for years.

For consumers, these actions highlight that data security is not just an IT problem—it is a core consumer protection issue that companies are expected to address.

3. Immediate Steps If You Think You Were Affected

If you stayed at a Starwood-branded property on or before September 10, 2018, it is reasonable to assume your information may have been part of the compromised database. Even if you are unsure, you can take protective actions that are useful after any major data breach.

3.1 Watch for notices from Marriott and your bank

• Check your email and postal mail for official communications describing what information of yours may have been exposed and what support is offered.
• Review statements from banks and credit card issuers for unfamiliar charges, especially if you used a card at a Starwood property during the affected period.

In the United States, federal guidance encourages consumers to monitor accounts regularly after breaches and to report suspicious activity promptly to financial institutions.

3.2 Review account activity and set alerts

For any credit or debit card you used with Marriott or Starwood:

• Log in to your online banking or card portal and review recent transactions.
• Enable text or email alerts for purchases, particularly for card-not-present transactions or charges over a certain amount.
• Ask your bank or issuer whether they recommend replacing your card numbers.

Financial regulators note that timely reporting of unauthorized charges can limit your liability under federal law for many consumer accounts.

3.3 Consider a fraud alert or credit freeze

If your Social Security number or similar national identifier was not involved, a full credit freeze may not be necessary. However, because passport numbers and other data were exposed, you may still want an extra layer of protection. In the U.S., you can:

• Place a fraud alert on your credit file, which tells lenders to take extra steps to verify your identity before opening new credit in your name.
• Request a credit freeze, which generally blocks new creditors from accessing your credit report until you lift the freeze.

The FTC explains how to contact the nationwide credit reporting companies and the implications of each option, including that a credit freeze does not affect your existing credit accounts or scores.

4. Longer-Term Protection After a Large Breach

The Marriott Starwood incident illustrates that the consequences of a data breach can last for years. Even if you do not see suspicious activity right away, your information may circulate on criminal marketplaces or be used in future phishing campaigns. Adopting a few long-term habits can significantly lower your overall risk.

4.1 Monitor your credit reports regularly

In many countries, consumers have a legal right to periodic access to their credit reports. In the United States, federal law allows you to receive credit reports from the major credit reporting companies. Reviewing these reports helps you spot:

• New accounts you did not open.
• Unexpected credit inquiries.
• Changes in personal information that you did not authorize.

If you find unfamiliar accounts or entries, reporting them quickly to the credit reporting company and the creditor can reduce damage and support any future identity theft report.

4.2 Protect your online hotel and travel accounts

Travel loyalty accounts can be attractive to criminals because they store points with real monetary value and often contain personal details. To better protect these accounts:

• Use a unique, strong password for your hotel, airline, and travel accounts.
• Enable multi-factor authentication (MFA) whenever it is available.
• Review your loyalty balances and recent activity for unfamiliar reservations or point redemptions.

Enforcement documents related to the Marriott breaches highlight the importance of strong authentication and access controls on systems handling sensitive information. Those same principles apply to individual consumer accounts.

4.3 Be cautious with phishing and social engineering

Once attackers have your name, contact details, and travel history, they can craft convincing scams. You may receive messages that appear to be from Marriott, other hotel brands, airlines, or payment providers. To protect yourself:

• Be skeptical of unsolicited emails, texts, or calls that ask for passwords, one-time codes, or payment information.
• Instead of clicking links in messages, navigate directly to the company’s official website using a bookmark or by typing the address.
• Verify unexpected requests by calling the organization using a trusted phone number, not one provided in a suspicious message.

Government consumer protection agencies frequently warn that phishing attempts often follow major breaches because criminals know affected consumers are expecting legitimate notices.

5. If Your Passport or Government ID Was Involved

Passport numbers are particularly sensitive because they are used as proof of identity in many contexts. Regulatory reports state that millions of passport numbers were involved in the Starwood incident, and not all were properly encrypted.

5.1 Check guidance from your issuing authority

If you believe your passport number was exposed:

• Consult the website or customer service channels of your passport office or foreign ministry.
• Look for specific guidance on what to do if your passport has been lost, stolen, or compromised in a data breach.
• Ask whether they recommend replacing the document or simply monitoring for misuse.

Some jurisdictions may not reissue passports solely because the number was involved in a breach, but they may have procedures for documenting the incident or flagging your file.

5.2 Document potential identity theft

If you later discover evidence that someone has used your passport or identity information fraudulently (for example, travel you did not undertake or accounts opened abroad), keep detailed records of:

• Correspondence with companies or agencies.
• Copies or screenshots of suspicious transactions or confirmations.
• Police reports or official incident numbers, if applicable.

Thorough documentation can help you work with authorities and financial institutions to correct records and contest any fraudulent activity.

6. What the Breach Tells Us About Corporate Data Security

While this guide focuses on what consumers can do, the Marriott Starwood incident also illustrates how corporate security practices affect individual risk. Public enforcement documents describe failures in areas such as password management, network segmentation, patching, logging, and multi-factor authentication. These details reflect broader lessons about how organizations should protect customer information.

6.1 Key security failings identified by regulators

According to a proposed complaint by the U.S. Federal Trade Commission, Marriott and Starwood made public statements suggesting they had appropriate security, but failed to implement reasonable safeguards in several critical areas:

• Inadequate password controls and access management.
• Weak or missing firewall and network segmentation practices.
• Failure to patch outdated software and systems in a timely manner.
• Insufficient logging and monitoring of the network environment.
• Limited or inconsistent use of multi-factor authentication on sensitive systems.

For consumers, this underscores why asking companies about their security practices and supporting strong privacy and security regulations can have direct, practical benefits.

6.2 Corporate accountability and consumer rights

As part of regulatory actions, Marriott agreed to implement a robust information security program, retain data only as long as reasonably necessary, and provide mechanisms for customers to request deletion of certain personal information. These requirements aim to reduce the risk of similar incidents and to give consumers greater control over their data.

Depending on your country, you may have rights to:

• Access personal information companies hold about you.
• Request corrections to inaccurate data.
• Ask for deletion of certain categories of information, subject to legal and contractual limits.
• Receive breach notifications when your data has been exposed.

Checking your national or regional data protection authority’s guidance can clarify which rights apply to you and how to exercise them.

7. Frequently Asked Questions (FAQs)

Q1: How do I know if my information was part of the Marriott Starwood breach?

If you made a reservation at a Starwood-branded hotel on or before September 10, 2018, your data may have been stored in the compromised database. Marriott indicated it would notify affected guests, but even if you do not recall receiving a notice, it is reasonable to take precautionary steps such as monitoring accounts and checking your credit reports.

Q2: Can criminals open new credit accounts with the information from this breach?

Alone, hotel reservation data may not always be enough to open new credit, but combined with other breached data, it can be misused for identity theft or to answer security questions. That is why regulators recommend monitoring your credit reports, placing fraud alerts, or considering a credit freeze if you believe enough information has been exposed to put you at higher risk.

Q3: Should I cancel my credit card if I used it at a Starwood hotel?

You do not always need to cancel a card simply because it was used at a company that experienced a breach. However, if the incident involved payment card data, your issuer may recommend replacing the card as a precaution. At minimum, enable transaction alerts, review statements carefully, and report any suspicious charges right away so your liability is limited under applicable law.

Q4: Do I need a new passport if the number was exposed?

Whether you should replace your passport depends on guidance from your country’s issuing authority. Some may not automatically reissue passports solely due to a breach but may offer instructions on monitoring for misuse or documenting the incident. Check the official website or contact center of your passport office or foreign ministry for their current recommendations.

Q5: What general steps help after any major data breach?

Across breaches, consumer protection agencies commonly suggest: monitoring bank and card statements, reviewing credit reports, considering fraud alerts or freezes, using strong and unique passwords with multi-factor authentication, and being cautious of phishing attempts that reference the incident. These practices reduce the chances that criminals can convert stolen data into successful fraud.

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Author

Sneha TeteBeauty & Lifestyle Writer

 

Sneha is a relationships and lifestyle writer with a strong foundation in applied linguistics and certified training in relationship coaching. She brings over five years of writing experience to waytolegal,  crafting thoughtful, research-driven content that empowers readers to build healthier relationships, boost emotional well-being, and embrace holistic living.

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