CVE-2023-43208Known exploitationPublic exploitNetwork attack vector

Unauthenticated code execution via unsafe XML deserialization

Published Oct 26, 2023 · Updated Oct 21, 2025

Unsafe deserialization in NextGen Healthcare Mirth Connect before 4.4.1 allows remote attackers to execute arbitrary code through XML. The pre-authentication XmlMessageBodyReader passes attacker-supplied XML to XStream, whose denylist permits third-party gadget chains such as InvokerTransformer. A crafted request to an affected API endpoint therefore runs commands with the Mirth Connect service account's privileges without authentication or user interaction.

CVSS severity9.8
Critical
EPSS probability85.89%
Next 30 days · Nov 1, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unsafe deserialization in NextGen Healthcare Mirth Connect before 4.4.1 allows remote attackers to execute arbitrary code through XML. The pre-authentication XmlMessageBodyReader passes attacker-supplied XML to XStream, whose denylist permits third-party gadget chains such as InvokerTransformer. A crafted request to an affected API endpoint therefore runs commands with the Mirth Connect service account's privileges without authentication or user interaction.

The record

CVE
CVE-2023-43208
Published
Oct 26, 2023
Updated
Oct 21, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-502, CWE-78, T1059, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 26, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsShadowserver observations through Sep 28, 2026. Gaps indicate unavailable data.
Sep 22, 2026Sep 28, 2026
View daily counts
Reporting dayUnique IPs
Sep 22, 202621
Sep 23, 202616
Sep 24, 202613
Sep 25, 20265
Sep 26, 202613
Sep 27, 20266
Sep 28, 202617
Latest reporting daySep 28, 2026
Latest daily unique IPs17
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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