External risk intelligence

InterSystems IRIS for Health Default TLS/SSL Encryption Off

CVE advisorySeverity: CRITICAL (CVSS 9.2)

CVE-2026-111594

InterSystems IRIS for Health is a data platform often deployed to support web applications, APIs, and healthcare data services. Because it frequently functions as a backend server or gateway for enterprise-wide data exchange, it is commonly deployed in network-accessible configurations where its management or service interfaces may be exposed to internal or external network segments.

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

A security issue has been identified in InterSystems IRIS for Health where TLS/SSL encryption is not enabled by default. This could allow an attacker to intercept and view sensitive data transmitted over the network, potentially leading to unauthorized access. The main concern is confirming relevance and exposure within our environment.

  • Unencrypted data transmission may be viewed.
  • Protects sensitive data and system access.
  • Confirm relevance and understand exposure.

Attack Path

How an attacker could exploit the issue

An attacker could gain access to a system running InterSystems IRIS for Health by intercepting network traffic, as the default TLS/SSL encryption is turned off. This exposure allows them to view sensitive data, which can then be used to authenticate and log into the device.

  • Network traffic is unencrypted by default.
  • An attacker views transmitted data.
  • Leads to unauthorized device login.

Live Threat

Current exploitation, exposure, and threat context

When TLS/SSL encryption is not enabled by default, an attacker could view transmitted data, potentially leading to unauthorized access to the device.

  • System data and login credentials at risk.
  • Unencrypted data transmission could be intercepted.
  • Unauthorized access to the device.

Operational Fix

Recommended remediation, mitigation, and detection steps

Real-world remediation for this critical vulnerability likely falls under the purview of platform or infrastructure teams managing InterSystems IRIS for Health deployments, in coordination with application owners who rely on the platform. The immediate first step should be to inventory all instances of InterSystems IRIS for Health, determine their network exposure and business criticality, and identify the accountable system owner for each instance before planning remediation.

  • Confirm platform and application ownership.
  • Verify network exposure and criticality.
  • Plan and coordinate configuration updates.

Supplementary metadata

Validate whether this threat affects your internet-facing exposure.

Halo Threat Intelligence helps prioritize remediation with Halo Surface Signal and H/A/L/O context. Start exposure validation with a free external attack surface trial.

Frequently asked questions

What is InterSystems IRIS for Health?

InterSystems IRIS for Health is a specialized data platform engineered for the healthcare industry. It serves as a high-performance database and integration engine used to manage complex medical records, power clinical applications, and facilitate interoperability between healthcare systems and APIs.

What does CVE-2026-111594 mean by Cleartext Transmission?

This vulnerability relates to CWE-319, which is the weakness of transmitting data in cleartext. In this case, the software does not enforce encrypted TLS/SSL communication by default. Because the connection is not encrypted, any sensitive information—including authentication credentials—sent over the network is sent as plain text that an observer can read.

How can an attacker trigger this vulnerability?

An attacker triggers this by intercepting network traffic directed to the platform. The bug relies on the absence of encryption; therefore, it does not occur if TLS/SSL is already explicitly enabled for the connection. If encryption is not configured, the traffic remains readable to anyone positioned to monitor the network path between the client and the server.

Is my system at risk according to Halo Surface Signal?

Halo Surface Signal indicates that InterSystems IRIS for Health is often deployed as a backend server or gateway for enterprise data exchange. Because it frequently occupies network-accessible segments to support APIs or web applications, there is a likely possibility that your instance is exposed to internal or external network traffic where interception is possible.

What is the first step to address this issue?

The priority is to identify every instance of InterSystems IRIS for Health within your infrastructure. Once you have an inventory, verify the current encryption settings for each deployment and determine which services are exposed to the network. Coordinate with the designated application owners to plan the necessary configuration updates to enable TLS/SSL.

References