Lessons from FHIR Interoperability: Security Challenges and Countermeasures in Healthcare Data Linkage

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This article analyzes two major security incidents related to the digitalization of medical information systems in Taiwan. The first case involved the leakage of complete patient records due to insufficient safety testing and API key management (without HSM) during the rapid deployment of FHIR Box. The second incident occurred when a third-party application (SMART App) was exploited—due to OAuth2.0 configuration errors and lack of PKCE—leading to the hospital's entire EHR system being paralyzed by ransomware. These incidents demonstrate that merely implementing technical standards (like FHIR or OAuth2.0) is insufficient; strict adherence to 'principle of least privilege,' rigorous access control at API gateways, and comprehensive supply chain risk assessment are essential. Furthermore, the article emphasizes that information security must not be confined to the IT department but requires all staff to act as 'first lines of defense' through continuous safety education (e.g., phishing drills). As technology advances—integrating 'digitalization,' 'informatization,' and 'embodied intelligence' alongside FHIR and AI—the implementation of multi-layered defenses based on Zero Trust Architecture, along with establishing disaster recovery plans (RPO/RTO), is crucial.