CVE-2026-78224

HIGH 8.2

NextGen Healthcare Mirth Connect Improper Restriction of XML External Entity Reference

CVSS Score

8.2

EPSS Score

0.0%

EPSS Percentile

0th

The XSLT Transformer Step builds a bare TransformerFactory without the proper security options set, so XXE injection can allow data exfiltration and denial-of-service attacks.

CWE	CWE-611
Vendor	nextgen healthcare
Product	mirth connect
Published	Sep 11, 2026
Last Updated	Sep 11, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

Low

Affected Versions

NextGen Healthcare / Mirth Connect

0 ≤ 4.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

cisa.gov: https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-01 github.com: https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsma-26-253-01.json

Credits

Abhinav Agarwal reported this vulnerability to CISA.