South Korea’s military has reported unauthorized access to a medical imaging system containing sensitive records linked to approximately 1.15 million people. The incident involved the Armed Forces Medical Command’s mobile Picture Archiving and Communication System, commonly known as PACS, which enables medical staff to view X-rays, CT scans and MRI images. Although investigators have not confirmed that information was stolen, the breach has raised serious concerns about the security of military healthcare data.
According to the Defense Ministry, the intrusion took place between November and December 2025 and may have involved approximately 8 gigabytes of medical information. This estimate was based on network traffic, rather than a confirmed list of downloaded files. Officials said the amount could be equivalent to nearly 1,000 X-ray images, but they have not identified the exact records that may have been viewed or accessed.
The potentially exposed information includes patients’ names, sex, ages, medical imaging dates and diagnostic images. The system was used by six military hospitals located in Goyang, Yangju, Pocheon, Gangneung, Guri and Daegu. However, authorities emphasized that the figure of 1.15 million represents all individuals whose records were stored in the system, not the number of people whose information was definitely accessed or copied.
The breach was discovered in April during a security inspection led by the Defense Counterintelligence Command. In June, the Defense Ministry, Defense Cyber Command, Defense Counterintelligence Command and Armed Forces Medical Command formed a joint investigation team to determine how the unauthorized access occurred and assess its full impact. Investigators reportedly found that an open network communications port allowed the intruder to enter the system, and that the port remained exposed from November 2025 until March 2026.
The military suspended the medical imaging system immediately after identifying the incident. Officials have not disclosed the identity or origin of the intruder, nor have they confirmed whether any medical information was transferred outside the network. The case highlights the risks created by exposed network ports and insufficient access controls, particularly in systems containing health and military data. South Korea’s Defense Ministry said it would correct the identified weaknesses and strengthen cybersecurity measures to prevent similar incidents in the future.
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