InterSystems Corporation InterSystems IRIS for Health

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Summary
Successful exploitation of this vulnerability could allow an attacker to view transmitted data and use that data to log into the device. The following versions of InterSystems Corporation InterSystems IRIS for Health are affected:

InterSystems IRIS for Health 2026.2.0.221, 2026.1.0.235, 2025.3.0.226 (CVE-2026-111594, CVE-2026-111594, CVE-2026-111594)





CVSS
Vendor
Equipment




v3 8.1
InterSystems Corporation
InterSystems IRIS for Health






1 Vulnerability




Cleartext Transmission of Sensitive Information




Background

Critical Infrastructure Sectors: Healthcare and Public Health Countries/Areas Deployed: Worldwide Company Headquarters Location: United States


Vulnerabilities

CVE-2026-111594
InterSystems IRIS for Health has TLS/SSL encryption turned off by default, which may enable an attacker to view transmitted data and use that data to log into the device.
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3 Affected Products

InterSystems Corporation InterSystems IRIS for Health: 2026.2.0.221

Product Status: known_affected

Remediations

MitigationInterSystems recommends users configure IRIS superserver to require SSL/TLS: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.c
ls?KEY=ROARS_gsecuring_checklist Note that there are three settings: "Disabled", which means that client communications do not use TLS. "Enabled", which means that client communications may use TLS (but they also may not) and "Required", which forces all client communications to use TLS.


MitigationInterSystems documentation explains how to configure the server to require TLS: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Pa ge.cls?KEY=GSA_manage_superserver


MitigationFor more information about how to configure a system to mitigate this vulnerability, contact InterSystems at their world wide response center: https://wrc.intersystems.com (login required)


InterSystems Corporation InterSystems IRIS for Health: 2026.1.0.235

Product Status: known_affected

Remediations

MitigationInterSystems recommends users configure IRIS superserver to require SSL/TLS: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.c
ls?KEY=ROARS_gsecuring_checklist Note that there are three settings: "Disabled", which means that client communications do not use TLS. "Enabled", which means that client communications may use TLS (but they also may not) and "Required", which forces all client communications to use TLS.


MitigationInterSystems documentation explains how to configure the server to require TLS: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Pa ge.cls?KEY=GSA_manage_superserver


MitigationFor more information about how to configure a system to mitigate this vulnerability, contact InterSystems at their world wide response center: https://wrc.intersystems.com (login required)


InterSystems Corporation InterSystems IRIS for Health: 2025.3.0.226

Product Status: known_affected

Remediations

MitigationInterSystems recommends users configure IRIS superserver to require SSL/TLS: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Page.c
ls?KEY=ROARS_gsecuring_checklist Note that there are three settings: "Disabled", which means that client communications do not use TLS. "Enabled", which means that client communications may use TLS (but they also may not) and "Required", which forces all client communications to use TLS.


MitigationInterSystems documentation explains how to configure the server to require TLS: https://docs.intersystems.com/irislatest/csp/docbook/DocBook.UI.Pa ge.cls?KEY=GSA_manage_superserver


MitigationFor more information about how to configure a system to mitigate this vulnerability, contact InterSystems at their world wide response center: https://wrc.intersystems.com (login required)


Additional Metrics
Relevant CWE: CWE-319 Cleartext Transmission of Sensitive Information




CVSS Version
Base Score
Base Severity
Vector String




3.1
8.1
HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H


4.0
9.2
CRITICAL
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N





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Acknowledgments

Abhinav Agarwal reported this vulnerability to CISA and InterSystems Corporation.


Recommended Practices
CISA recommends users take defensive measures to minimize the risk of exploitation of these vulnerabilities.

Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices.

CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices
on the ICS webpage on cisa.gov/ics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov/ics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Strategies.
Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
CISA also recommends users take the following measures to protect themselves from social engineering attacks:

Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.

No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

Revision History

Initial Release Date: 2026-10-22




Date
Revision
Summary




2026-10-22
1
Initial Publication




Legal Notice and Terms of Use

https://www.cisa.gov/news-events/ics-medical-advisories/icsma-26-295-01

2026-10-22 12:00 UTC

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