CVE-2026-78224 NextGen Healthcare CVE debrief

Who should care

Defenders responsible for NextGen Healthcare's Mirth Connect systems should assess exposure and prioritize remediation. This includes operators, platform administrators, vulnerability management teams, and security teams. They should verify affected versions and scope, review compensating controls, and plan vendor-supported updates or mitigations through normal change control.

Why it matters

The CVE-2026-78224 vulnerability in NextGen Healthcare's Mirth Connect allows for XXE injection, potentially leading to data exfiltration and denial-of-service attacks. Defenders should assess exposure, prioritize remediation, and verify affected versions and scope.

• Potential data exfiltration through XXE injection
• Potential denial-of-service attacks through XXE injection
• Requires verification of affected versions and scope
• Remediation priority for exposed systems

Technical summary

The XSLT Transformer Step in Mirth Connect builds a bare TransformerFactory without proper security options, allowing for XXE injection attacks. This vulnerability can lead to data exfiltration and denial-of-service attacks. Defenders should assess exposure and prioritize remediation of affected systems. The vulnerability's technical details indicate a high-priority remediation requirement.

Defensive priority

High priority remediation required for affected systems

Recommended defensive actions

• Assess exposure of Mirth Connect systems to XXE injection attacks
• Prioritize remediation of affected systems
• Verify affected versions and scope

Evidence notes

The CVE record and NVD entry provide limited information on affected versions and scope. Further verification is required to determine the extent of the vulnerability. The official CVE Program record and NIST NVD detail page offer source-provided CVE metadata and vulnerability assessment. However, additional investigation is necessary to confirm affected product deployments and assign an owner for follow-up.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.