University of Mississippi Medical Center Data Breach: What Happened and What You Should Do
University of Mississippi Medical Center disclosed a data breach affecting 912,898 people. Here's what is currently known about the incident, what information may have been exposed, and steps you can consider taking.
- Company
- University of Mississippi Medical Center
- People affected
- 912,898
UMMC reported 912,898 people affected in total, including 2,778 Texas residents, in its report to the Texas Attorney General (published November 3, 2026). Vermont's table lists 17 Vermont residents.
- Incident date
- February 11 – 19, 2026
- Discovered
- February 19, 2026
- Disclosed
- November 2, 2026
- Information exposed
- Name · possibly physical address, date of birth, social security number, government identification, financial information, health information, insurance information
- Status
- Notification underway
Notices mailed with complimentary identity monitoring and a 90-day response line.
What happened in the University of Mississippi Medical Center breach?
How the attacker got in
An unauthorized party accessed UMMC's computer network, and files containing personal and health information may have been accessed or taken.
Reports conflict
Timeline of what is known
- 01February 11 – 19, 2026Unauthorized access
- 02February 19, 2026Breach discovered
- 03November 2, 2026Breach disclosed publicly
- 04November 2026Affected individuals notified
Dates come from the sources listed at the bottom of this page. Separate events are kept separate; where a date has not been disclosed, it says so.
What information was exposed?
The categories below come from University of Mississippi Medical Center's disclosure and the sources listed on this page. Each is labeled by what the evidence supports. Categories not mentioned in any source are not listed, even if they are common in similar breaches.
Name
Full name (UMMC notice; Texas AG report).
Physical address
Address (Texas AG report).
Date of birth
Date of birth (Texas AG report).
Social Security number
Social Security number (Texas AG report; Vermont AG table).
Government identification
Driver's license or other government ID number (Texas AG report; Vermont AG table).
Financial information
Financial account and credit or debit card information (Texas AG report; Vermont AG table).
Health information
Medical information and health records (Texas AG report; Vermont AG table).
Insurance information
Health insurance information (Texas AG report).
Why this information matters
The risks below are the ones associated with the categories of information involved in this breach. This describes how exposed information can be used in general. It does not state that any of this has happened with data from this incident.
Information from one breach can sometimes be combined with information from other breaches or public sources. A name and email address on their own are limited. Paired with a date of birth from one leak and an address from a people-search site, they become enough to answer a security question or make a scam call sound informed.
Whether the data from this breach has been sold, shared, or used is not known unless a source on this page says so. Where that is documented, it appears in the "What happened" section above.
If you were affected, consider doing these things now
Practical steps for this breach, in rough order of priority. None of these require buying anything. Monitoring services, including ours, are one option among several.
- 01Enroll in the complimentary identity monitoring using the code and deadline in your letter.
- 02Consider a free credit freeze with Equifax, Experian, and TransUnion; it blocks new accounts in your name and is free to place and lift.
- 03Request an IRS Identity Protection PIN to help stop someone else from filing a tax return with your Social Security number.
- 04Review account statements and credit reports for activity you do not recognize.
- 05Review explanation of benefits statements from your health insurer for care you did not receive, and verify any call about this incident using the number in your letter.
AI Protection
Monitoring, alerts, and recovery help for what comes after a breach.
A breach puts information you can't take back into circulation. AI Protection watches for it being misused, alerts you when something changes, and helps you recover if something goes wrong. It cannot undo the breach or retrieve data an attacker already holds.
How one breach can contribute to a larger exposure footprint
A possible risk pattern, not a description of this incident. Each step is something that can happen after a breach. Nothing here states that it has happened with data from this incident.
Illustrative pattern- Step 1
One breach
A single company's records are accessed without authorization.
- Step 2
Personal information is exposed
Some categories can be changed afterward. Others, like a name or date of birth, can't.
- Step 3
It may remain accessible
Copies of breached data can persist well beyond the original incident.
- Step 4
Sources can be combined
Fragments from different breaches and public sources may be assembled into a fuller profile.
- Step 5
More targeted attempts
A fuller profile can make fraud, impersonation, phishing, or social engineering attempts more convincing.
A breach is an event. Exposure can last longer.
A password can be reset and a card reissued. Some information can't be replaced, and that is the part that stays useful to someone attempting fraud later. This does not mean fraud will occur. It means the risk does not close when the news cycle does.
Involved in this breach and hard to change
None of the categories reported in this breach are in the hard-to-change group. Changeable items like passwords and account numbers should still be addressed.
What University of Mississippi Medical Center has done so far
Only actions the company has announced or that are documented in the sources below. If something you'd expect to see isn't here, it hasn't been announced as of the last update.
Sources
Primary sources first: company disclosures, regulator and attorney general filings, SEC filings, court documents. News reporting is listed as secondary. Where reports conflict, the conflict is noted in the "What happened" section rather than resolved silently.
Last updated November 4, 2026 · First published November 4, 2026
Questions about the University of Mississippi Medical Center breach
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