CVE-2026-78224 NextGen Healthcare CVE debrief

Who should care

Defenders and security teams responsible for systems using the XSLT Transformer Step should assess exposure and prioritize verification and patching to prevent potential XXE injection attacks.

Why it matters

CVE-2026-78224 is a high-severity vulnerability in an XSLT Transformer Step that allows for XXE injection, potentially leading to data exfiltration and denial-of-service attacks. Defenders should prioritize verifying and patching affected systems to prevent potential XXE injection attacks.

• Potential data exfiltration through XXE injection
• Potential denial-of-service attacks through XXE injection
• Need for verification of affected systems and patching
• Importance of monitoring for potential XXE injection attacks

Technical summary

The XSLT Transformer Step builds a bare TransformerFactory without proper security options set, allowing for XXE injection attacks that can lead to data exfiltration and denial-of-service attacks. The vulnerability is caused by the lack of proper security configurations in the XSLT Transformer Step, which allows an attacker to inject malicious XML code. This can lead to data exfiltration and denial-of-service attacks. Defenders should prioritize verifying and patching affected systems, especially those using the XSLT Transformer Step, to prevent potential XXE inj

Defensive priority

Defenders should prioritize verifying and patching affected systems, especially those using the XSLT Transformer Step, to prevent potential XXE injection attacks.

Recommended defensive actions

• Verify and patch affected systems using the XSLT Transformer Step
• Monitor for potential XXE injection attacks
• Review and update security configurations for the XSLT Transformer Step

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, but do not specify affected versions or provide remediation guidance.

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.