University of Mississippi Medical Center Ransomware Attack Disrupts Epic EHR and Forces Statewide Clinic Closures
The University of Mississippi Medical Center (UMMC) reported a ransomware attack that knocked multiple IT systems offline, including access to its Epic electronic health record (EHR) platform, triggering the organization’s emergency operations plan. The disruption forced UMMC to close all 35 clinics statewide and cancel outpatient, elective, and clinic procedures, while hospital and emergency services remained open under contingency operations.
UMMC stated the attackers have been in communication and that it is working with external specialists and law enforcement; the FBI is investigating and warned the duration of the outage was unknown at the time of reporting. Separate reporting also described a different municipal incident in Meriden, Connecticut, where officials took city internet services and public Wi‑Fi offline after an attempted disruption; emergency services were reported as unaffected and the city said it would conduct a comprehensive review before restoring service.
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How this story unfolded
5 events from the most recent confirmed update back to the earliest known activity.
Clinic shutdown extends into a second day as recovery continues
On 2026-02-20, UMMC said clinic closures and canceled elective services were continuing for a second consecutive day while officials assessed the incident and worked to restore offline systems. The organization warned the disruption could last for days, although hospital and emergency care remained operational.
UMMC confirms contact from attackers during ransomware response
By 2026-02-19, UMMC leadership said the attackers had communicated with the organization, though it did not identify the group or disclose any ransom demands. No ransomware gang had publicly claimed responsibility at that time.
UMMC and federal authorities begin incident response investigation
On 2026-02-19, UMMC said it was working with law enforcement and federal agencies including the FBI, CISA, and DHS, along with outside specialists, to investigate and respond to the ransomware incident. Officials said it was too early to determine the full impact, including whether patient data was compromised or how long recovery would take.
UMMC closes clinics and cancels non-emergency care statewide
Following the attack on 2026-02-19, UMMC closed all or most clinic locations across Mississippi and canceled elective procedures, outpatient and ambulatory surgeries, imaging appointments, and other non-emergency services. Hospitals and emergency rooms remained open using downtime procedures, with staff in some areas reverting to paper documentation.
Ransomware attack hits UMMC and disrupts statewide IT systems
On 2026-02-19, the University of Mississippi Medical Center detected a ransomware attack that compromised or disrupted multiple IT systems, including access to its Epic electronic medical records platform. UMMC took network systems offline as a precaution and activated its emergency operations plan.
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Sources
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UMMC Shuts Clinics While it Grapples with Ransomware Attack
hipaajournal.com
Open sourceMississippi hospital system closes all clinics after ransomware attack
techxplore.com
Open sourceMississippi medical center closes all clinics after ransomware attack
bleepingcomputer.com
Open sourceteiss - News - Ransomware attack shuts down University of Mississippi Medical Center network, forces statewide clinic closures
teiss.co.uk
Open sourceUniversity of Mississippi Medical Center closes all clinics in wake of cyberattack - DataBreaches.Net
databreaches.net
Open sourceUniv. of Mississippi Medical Center Dealing With Cyberattack
govinfosecurity.com
Open sourceUniv. of Mississippi Medical Center Dealing With Cyberattack
bankinfosecurity.com
Open sourceUMMC confirms cyberattack, closing clinics and canceling surgeries
wlbt.com
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University of Mississippi Medical Center Ransomware Attack Disrupts Epic EHR and Statewide Clinics
The **University of Mississippi Medical Center (UMMC)** restored normal operations after a major **ransomware attack** that disrupted IT systems for roughly nine days, including loss of access to **electronic medical records** and impacts to patient care across the state. The incident forced UMMC to cancel outpatient procedures, ambulatory surgeries, and imaging appointments, while hospitals and emergency departments continued operating using manual *downtime procedures*; phone communications were also affected. UMMC reported restoring access to patient records and reopening clinics with extended hours to address the backlog. Officials said they were **communicating with the attackers** and working with the **FBI** and **CISA** during the response and investigation. As of the latest reporting, **no ransomware group has claimed responsibility**, and there was **no confirmed evidence of data exfiltration** disclosed in official statements.
Mar 24, 2026
Ransomware Attack Disrupts University of Mississippi Medical Center and Triggers Privacy Scrutiny
A ransomware attack forced the University of Mississippi Medical Center to take major systems offline, disrupting its phone network, broader IT environment, and Epic electronic health record platform. UMMC closed all 35 clinics across Mississippi, canceled appointments including chemotherapy and elective procedures, and shifted staff to paper documentation while keeping hospitals and emergency departments open. The medical center said it was working with the FBI, outside cybersecurity specialists, and vendors to investigate the intrusion and restore operations. UMMC later reopened clinics as systems were gradually brought back online, but the fallout extended beyond the immediate outage. Subsequent reporting said the incident may have exposed the organization to potential federal privacy-law issues, raising questions about whether protected health information was adequately safeguarded during the attack. The case highlights how ransomware against healthcare providers can quickly disrupt patient care, delay treatment, and create regulatory risk alongside operational recovery.
May 25, 2026
Medusa Ransomware Claims University of Mississippi Medical Center Attack
**University of Mississippi Medical Center (UMMC)** is facing an extortion threat after the **Medusa** ransomware gang claimed responsibility for the February cyberattack that disrupted hospital operations and forced staff to rely on paper processes and other offline workarounds. The incident affected one of Mississippi’s most critical healthcare providers, with hospitals and emergency departments remaining open while **35 clinic locations** were closed; recovery involved assistance from the **FBI** and **Department of Homeland Security**, and full reopening was reported on March 2. Medusa later posted on its leak site that it had stolen data from UMMC and demanded **$800,000**, with a deadline of **March 20**. Reporting indicates the gang offered multiple extortion options, including paying to delete the data, buying the allegedly stolen information, or paying a smaller amount to extend the deadline. Screenshots were published as purported proof of theft, but UMMC had not confirmed that sensitive patient or enterprise data was actually exfiltrated, and the size and scope of the alleged data set remained unclear at the time of reporting.
Mar 21, 2026