CVE-2026-82583: NextGen Healthcare Mirth Connect SQL Injection and XXE — Detection and Remediation Guide

On the healthcare integration landscape, few products sit as close to the crown jewels as Mirth Connect. NextGen Healthcare's interface engine brokers HL7v2, FHIR, DICOM, and flat-file traffic between EHRs, lab systems, radiology platforms, pharmacies, and billing engines — which means it routinely holds database credentials, API keys, and live streams of protected health information (PHI). CISA's newly published medical advisory ICSMA-26-253-01 discloses three vulnerabilities in Mirth Connect that, if successfully exploited, allow an attacker to exfiltrate data or cause a denial-of-service condition.

The affected CVEs are CVE-2026-82583, CVE-2026-78224, and CVE-2026-82578, carrying a CVSS v3 score of 8.3 (High). The underlying weaknesses are Improper Neutralization of Special Elements used in an SQL Command (SQL Injection, CWE-89) and Improper Restriction of XML External Entity Reference (XXE, CWE-611). All Mirth Connect versions 4.7.1 and earlier are affected, and the product is deployed worldwide across the Healthcare and Public Health critical infrastructure sector.

If your organization runs interfaces through Mirth — and in U.S. healthcare, odds are strong that it does — treat this as a priority patching event. An interface engine with SQL injection and XXE exposure is not a theoretical risk; it is a direct path to the databases and message stores that hold your patient data.

Technical Analysis

Affected Products and Versions

• Product: NextGen Healthcare Mirth Connect (formerly NextGen Connect)
• Affected versions: 4.7.1 and all earlier releases
• Deployment footprint: Worldwide; heavily concentrated in hospitals, health systems, labs, and HIEs in the United States
• Architecture: Java-based application, typically deployed on Windows Server or Linux, fronted by an embedded web server with the Administrator interface and REST API exposed on TCP 8080/8443 (default), backed by a database (PostgreSQL, MySQL/MariaDB, SQL Server, or Oracle) for configuration and message storage

The Vulnerability Classes

SQL Injection (CWE-89) — CVE-2026-82583 and CVE-2026-82578 fall into this family per the advisory's weakness enumeration. Mirth Connect persists channel definitions, message content, user accounts, and connector state in its backing database. When user-controlled input reaches SQL queries without proper parameterization, an attacker can read arbitrary tables — which in a Mirth deployment means message content containing PHI, stored credentials for downstream systems, and configuration secrets. Error-based, UNION-based, or blind extraction are all plausible depending on where the injection points reside. A high-volume extraction attempt also degrades the engine's ability to process live clinical messages, producing the denial-of-service outcome CISA warns about.

XML External Entity Injection (CWE-611) — CVE-2026-78224 maps to the XXE weakness. Mirth Connect is an XML-heavy platform: channel configurations are exported/imported as XML, HL7v2 messages are frequently transformed to and from XML, and web service connectors consume XML payloads. When the XML parser is not configured to disallow Document Type Definitions (DTDs) and external entities, an attacker-supplied XML document can coerce the server into reading local files (e.g., mirth.properties, which contains the database password and encryption keystore settings), performing server-side request forgery (SSRF) against internal systems, or exhausting resources via entity expansion (a "billion laughs" style DoS).

Why This Combination Is Dangerous in Healthcare

Mirth Connect typically sits in a flat, trusted network zone with broad reachability: it talks to the EHR, the LIS, the RIS/PACS, and often cloud endpoints. Compromise of the engine yields:

1. Mass PHI exposure — the message store contains live clinical payloads.
2. Credential theft — mirth.properties and the CONFIGURATION table hold JDBC strings, SFTP keys, and API tokens.
3. Clinical disruption — a DoS against the interface engine halts orders, results, and ADT feeds, which is a patient-safety event, not just an IT event.

Exploitation Status

As of publication, CISA has not reported confirmed in-the-wild exploitation, and these CVEs are not yet listed in the CISA Known Exploited Vulnerabilities catalog. However, Mirth Connect has a documented history of attracting attacker interest — prior critical flaws in the platform (notably the 2023 unauthenticated RCE, CVE-2023-43208) were rapidly weaponized after disclosure. Healthcare defenders should assume public proof-of-concept research will follow this advisory quickly and act accordingly. Do not wait for KEV inclusion to patch an internet-reachable or broadly internally exposed interface engine.

Detection & Response

While patching is the priority, assume exposure and hunt retroactively. The three highest-fidelity detection surfaces for this threat are: (1) the Java/Mirth service process spawning unexpected child processes, (2) SQLi and XXE signatures in web/API request logs destined for the Mirth server, and (3) anomalous outbound network connections from the Mirth host (XXE-driven SSRF or exfiltration).

Sigma Rules

The following rules target the post-exploitation and pre-exploitation behaviors most relevant to this advisory. Tune the process names to your deployment: on Windows the engine typically runs as mcservice.exe wrapping java.exe; on Linux it runs directly under java.

---
title: Mirth Connect Java Process Spawning Command Shell or Script Interpreter
id: 4b7e2c91-8d3a-4f5e-9c21-7a6b8d0e2f44
status: experimental
description: Detects the Mirth Connect service (Java) spawning cmd.exe, PowerShell, or shell interpreters — a strong post-exploitation indicator following SQL injection or XXE-driven code execution against the interface engine.
references:
  - https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-01
  - https://attack.mitre.org/techniques/T1059/
author: Security Arsenal
date: 2026/04/06
tags:
  - attack.execution
  - attack.t1059
logsource:
  category: process_creation
  product: windows
detection:
  selection_parent:
    ParentImage|endswith:
      - '\java.exe'
      - '\javaw.exe'
      - '\mcservice.exe'
  selection_child:
    Image|endswith:
      - '\cmd.exe'
      - '\powershell.exe'
      - '\pwsh.exe'
      - '\wscript.exe'
      - '\cscript.exe'
      - '\mshta.exe'
      - '\rundll32.exe'
      - '\certutil.exe'
      - '\bitsadmin.exe'
  condition: selection_parent and selection_child
falsepositives:
  - Mirth Connect channels legitimately configured to invoke local scripts via destination connectors — inventory these and exclude by full command line
level: high
---
title: SQL Injection Patterns in Requests to Mirth Connect Administrator or API
id: 9c1d5f37-2a84-4b6e-8e10-3f5c7a92d611
status: experimental
description: Detects common SQL injection tokens in web requests to Mirth Connect administrative and REST API endpoints, sourced from web server, WAF, or reverse proxy logs fronting the engine.
references:
  - https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-01
  - https://attack.mitre.org/techniques/T1190/
author: Security Arsenal
date: 2026/04/06
tags:
  - attack.initial_access
  - attack.t1190
logsource:
  category: webserver
detection:
  selection_path:
    cs-uri-stem|contains:
      - '/api/'
      - '/webadmin/'
      - '/services/mirth'
  selection_sqli:
    cs-uri-query|contains:
      - 'UNION SELECT'
      - 'UNION%20SELECT'
      - 'OR 1=1'
      - '%27%20OR%20'
      - 'WAITFOR DELAY'
      - 'SLEEP('
      - 'BENCHMARK('
      - 'extractvalue('
      - 'updatexml('
      - 'information_schema'
  condition: selection_path and selection_sqli
falsepositives:
  - Vulnerability scanners and authorized penetration tests — correlate against known scanner source IPs
level: high
---
title: XXE Payload Indicators in Requests to Mirth Connect XML Endpoints
id: 6e3a8b24-5c79-4d12-a863-1b9e4f07c285
status: experimental
description: Detects XML external entity and DTD declarations in request bodies or query strings directed at Mirth Connect, indicative of CVE-2026-78224 exploitation attempts against the XML parsing stack.
references:
  - https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-01
  - https://attack.mitre.org/techniques/T1190/
author: Security Arsenal
date: 2026/04/06
tags:
  - attack.initial_access
  - attack.t1190
logsource:
  category: webserver
detection:
  selection:
    cs-uri-query|contains:
      - '<!ENTITY'
      - '%3C!ENTITY'
      - '<!DOCTYPE'
      - '%3C!DOCTYPE'
      - 'SYSTEM "file://'
      - 'SYSTEM%20%22file'
      - 'file:///etc/passwd'
      - 'file:///c:/windows'
      - 'expect://'
      - 'php://filter'
  condition: selection
falsepositives:
  - Rare; legitimate HL7/XML integrations do not transmit DTDs or entity declarations — investigate any hit
level: high

KQL — Microsoft Sentinel / Defender

This query hunts for Mirth Connect's Java process performing anomalous activity: suspicious child processes on the endpoint plus unexpected outbound connections. It assumes Sysmon/Defender for Endpoint telemetry on the Mirth host and, for the network side, Syslog/CEF ingestion of the host firewall or perimeter logs.

// Hunt 1: Mirth Connect Java process spawning suspicious children (post-exploitation)
let suspiciousChildren = dynamic(["cmd.exe","powershell.exe","pwsh.exe","wscript.exe","cscript.exe","mshta.exe","rundll32.exe","certutil.exe","bitsadmin.exe","whoami.exe","net.exe","nltest.exe"]);
DeviceProcessEvents
| where TimeGenerated > ago(14d)
| where InitiatingProcessFileName in~ ("java.exe","javaw.exe","mcservice.exe")
| where FileName in~ (suspiciousChildren)
| project TimeGenerated, DeviceName, AccountName, InitiatingProcessCommandLine, FileName, ProcessCommandLine, InitiatingProcessId, ProcessId
| order by TimeGenerated desc;
// Hunt 2: SQLi / XXE tokens in web logs destined for Mirth (Syslog/CEF ingestion from reverse proxy or WAF)
let sqliTokens = dynamic(["UNION SELECT","OR 1=1","WAITFOR DELAY","SLEEP(","information_schema","extractvalue(","updatexml("]);
let xxeTokens = dynamic(["<!ENTITY","<!DOCTYPE","SYSTEM \"file://","file:///etc/passwd","expect://","php://filter"]);
CommonSecurityLog
| where TimeGenerated > ago(14d)
| where RequestURL has_any ("/api/","/webadmin/","/services/mirth") or RequestURL has_any (sqliTokens) or RequestURL has_any (xxeTokens)
| where RequestURL has_any (sqliTokens) or RequestURL has_any (xxeTokens)
| summarize Hits=count(), FirstSeen=min(TimeGenerated), LastSeen=max(TimeGenerated) by SourceIP, RequestURL, DestinationHostName, DeviceAction
| order by Hits desc;
// Hunt 3: Unexpected outbound connections from the Mirth host (XXE SSRF / exfiltration)
DeviceNetworkEvents
| where TimeGenerated > ago(14d)
| where InitiatingProcessFileName in~ ("java.exe","javaw.exe","mcservice.exe")
| where RemoteIPType == "Public"
| where RemotePort !in (443, 80) or RemoteUrl !has_any ("nextgen.com","microsoft.com","windowsupdate.com")
| summarize Connections=count(), DistinctDestinations=dcount(RemoteIP) by DeviceName, RemoteIP, RemotePort, RemoteUrl
| order by Connections desc

Velociraptor VQL

Use this hunt across your Mirth hosts to surface suspicious child processes of the Java engine and unexpected network connections — the two fastest triage questions after an SQLi/XXE disclosure.

-- Hunt: Mirth Connect post-exploitation triage
-- Suspicious child processes of the Mirth Java service AND unexpected outbound connections
SELECT Pid, Ppid, Name, Exe, CommandLine, Username, CreateTime
FROM pslist()
WHERE (
    Name =~ '(?i)cmd\.exe|powershell\.exe|pwsh\.exe|wscript\.exe|cscript\.exe|mshta\.exe|rundll32\.exe|certutil\.exe'
    AND Ppid IN (
        SELECT Pid FROM pslist()
        WHERE Name =~ '(?i)java\.exe|javaw\.exe|mcservice\.exe|java$'
    )
)

-- Network check: non-standard outbound connections from the Mirth Java process
SELECT Pid, Name, Exe, Status,
       Laddr.IP AS LocalIP, Laddr.Port AS LocalPort,
       Raddr.IP AS RemoteIP, Raddr.Port AS RemotePort
FROM netstat()
WHERE Name =~ '(?i)java|mcservice'
  AND Status =~ 'ESTAB'
  AND Raddr.Port NOT IN (80, 443, 1433, 1521, 3306, 5432)
  AND NOT Raddr.IP =~ '^(10\.|172\.(1[6-9]|2[0-9]|3[01])\.|192\.168\.|127\.)'

Note: adjust the RFC1918 exclusion and the expected database ports to your environment — Mirth legitimately connects to its backing database and downstream endpoints, and those flows should be documented and excluded so real anomalies stand out.

Verification and Hardening Script

Run this Bash script on Linux-hosted Mirth Connect instances to inventory the deployed version, check XML parser hardening options, and lock down administrative interface exposure while you schedule the upgrade.

#!/bin/bash
# Mirth Connect exposure triage — ICSMA-26-253-01 (CVE-2026-82583 / CVE-2026-78224 / CVE-2026-82578)
# Run as root or with sudo on the Mirth host.

MIRTH_HOME="/opt/mirthconnect"

echo "=== [1] Installed Mirth Connect version ==="
if [ -f "$MIRTH_HOME/conf/mirth.properties" ]; then
  grep -E '^(mirth.version|version)' "$MIRTH_HOME/conf/mirth.properties" 2>/dev/null
fi
ls -d "$MIRTH_HOME" 2>/dev/null && cat "$MIRTH_HOME/docs/version.txt" 2>/dev/null
# Version 4.7.1 or earlier = VULNERABLE. Plan upgrade immediately.

echo "=== [2] Administrative interface binding (should NOT be 0.0.0.0) ==="
grep -E '^http\.host|^https\.host' "$MIRTH_HOME/conf/mirth.properties" 2>/dev/null

echo "=== [3] Exposed Mirth listeners ==="
ss -tlnp 2>/dev/null | grep -E 'java|mirth' | awk '{print $4, $6}'

echo "=== [4] DTD/XXE hardening flags present in JVM options? ==="
grep -RE 'disallow-doctype|FEATURE_SECURE_PROCESSING|external-general-entities' "$MIRTH_HOME/conf" 2>/dev/null || echo "No explicit XXE hardening found in configs"

echo "=== [5] Restrict egress from the Mirth host (temporary compensating control) ==="
# Allow only established DB/messaging egress; log everything else. ADAPT PORTS TO YOUR ENV.
# iptables -A OUTPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
# iptables -A OUTPUT -p tcp -m multiport --dports 443,1433,5432 -d <approved_subnet>/24 -j ACCEPT
# iptables -A OUTPUT -j LOG --log-prefix "MIRTH_EGRESS_DENY: "

echo "=== [6] Recent suspicious patterns in Mirth access/error logs ==="
grep -RiE 'UNION SELECT|OR 1=1|WAITFOR DELAY|<!ENTITY|<!DOCTYPE|SYSTEM "file://|/etc/passwd' \
  /opt/mirthconnect/logs/ 2>/dev/null | tail -50

echo "Triage complete. Any hit in [6] or unexpected listeners in [3] warrants IR escalation."

Remediation

1. Upgrade Mirth Connect immediately. All versions 4.7.1 and earlier are affected by CVE-2026-82583, CVE-2026-78224, and CVE-2026-82578. Obtain the current fixed release from NextGen Healthcare's official download/support channel and follow the vendor's upgrade procedure, including a full backup of the Mirth database and mirth.properties before upgrading. Validate channel functionality in a staging environment where feasible — but do not let change-control latency leave a vulnerable engine exposed; use the compensating controls below in the interim.
2. Remove administrative interface exposure. Confirm the Mirth Administrator and REST API (default TCP 8080/8443) are bound to a management interface only — never 0.0.0.0 on an internet-facing host, and ideally reachable only from a jump host or management VLAN via firewall policy.
3. Harden XML handling. Where connector design permits, disable DTD processing and external entity resolution in any custom XML parsing (Java channels/transformers should set XMLConstants.FEATURE_SECURE_PROCESSING and disallow DOCTYPE declarations). This is a durable defense against the XXE class even after patching.
4. Constrain the database account. The Mirth service's JDBC account should have the minimum privileges required against its own schema — never sa, root, or a DBO-equivalent. This blunts the blast radius of SQL injection against the engine's queries.
5. Egress filtering. Interface engines need to reach defined downstream systems — and nothing else. Deny-by-default egress from the Mirth host materially degrades both XXE-driven SSRF and data exfiltration paths.
6. Rotate secrets if compromise is suspected. If hunting surfaces exploitation indicators, treat database credentials, keystore passwords, SFTP keys, and API tokens stored in Mirth as compromised and rotate them. Also review the message store access logs for PHI exposure — a confirmed breach of the engine likely triggers HIPAA breach-notification obligations.
7. Reference advisories. Track CISA ICSMA-26-253-01 (https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-253-01) and NextGen Healthcare's vendor advisory for fixed-version confirmation and any updated guidance.

Executive Takeaways

Mirth Connect is the circulatory system of hospital data exchange, and this advisory hands attackers a map to it: SQL injection into the engine's backing store plus XXE in its XML parsing stack, scoring 8.3 and exposing PHI, credentials, and clinical message flow. There is no confirmed in-the-wild exploitation yet, but the platform's track record (rapid weaponization of its 2023 RCE) means the window between disclosure and exploitation will be short. Patch now, lock down the admin interface, constrain the service's database and network privileges, and hunt back 14 days for injection attempts and anomalous Java process behavior. If you find evidence of exploitation, treat it as a potential HIPAA reportable event and engage your IR retainer immediately.

Related Resources

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