Yokogawa FAST/TOOLS and CI Server

Summary

A critical vulnerability has been identified in Yokogawa FAST/TOOLS and CI Server, allowing attackers to retrieve CI Server setting information. The vulnerability, classified as CWE-319, has a high CVSS score of 7.5 (3.1) and 8.2 (4.0). Yokogawa recommends updating FAST/TOOLS to R10.04 SP4 and CI Server to R1.05 to mitigate the risk.

Full text

ICS Advisory Yokogawa FAST/TOOLS and CI Server Release DateJune 25, 2026 Alert CodeICSA-26-176-01 Related topics: Industrial Control System Vulnerabilities , Industrial Control Systems View CSAF Summary Successful exploitation of this vulnerability may return a response containing the CI Server setting information. The following versions of Yokogawa FAST/TOOLS and CI Server are affected: FAST/TOOLS >=R9.01|<=R10.04 Collaborative Information Server (CI Server) >=R1.01|<=R1.04 CVSS Vendor Equipment Vulnerabilities v3 7.5 Yokogawa Yokogawa FAST/TOOLS and CI Server Cleartext Transmission of Sensitive Information Background Critical Infrastructure Sectors: Critical Manufacturing, Energy, Food and Agriculture Countries/Areas Deployed: Worldwide Company Headquarters Location: Japan Vulnerabilities Expand All + CVE-2026-11833 The web server may return a response containing the CI Server setting information. This information could be exploited by an attacker for other attacks. View CVE Details Affected Products Yokogawa FAST/TOOLS and CI Server Vendor:Yokogawa Product Version:Yokogawa FAST/TOOLS: >=R9.01|<=R10.04, Yokogawa Collaborative Information Server (CI Server): >=R1.01|<=R1.04 Product Status:known_affected Remediations Vendor fixYokogawa recommends users update FAST/TOOLS up to R10.04 and apply patch software (R10.04 SP4). MitigationYokogawa recommends users update Collaborative Information Server (CI Server) up to R1.05. MitigationFor more information and details on implementing these mitigations, users should see the Yokogawa security advisory report YSAR-26-0004 at: https://web-material3.yokogawa.com/1/39777/files/YSAR-26-0004-E.pdf MitigationFor questions related to this report, please contact the below. https://contact.yokogawa.com/cs/gw?c-id=000498 Relevant CWE: CWE-319 Cleartext Transmission of Sensitive Information Metrics CVSS Version Base Score Base Severity Vector String 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N 4.0 8.2 HIGH CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N Acknowledgments Yokogawa reported this vulnerability to JPCERT/CC Legal Notice and Terms of Use This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability. 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 isolate 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. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. Revision History Initial Release Date: 2026-06-25 Date Revision Summary 2026-06-25 1 Initial CISA Republication of Yokogawa Security Advisory Report YSAR-26-0004 Legal Notice and Terms of Use This product is provided subject to this Notification and this Privacy & Use policy. Vendor Yokogawa Tags Sector: Critical Manufacturing Sector, Energy Sector, Food and Agriculture Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems Please share your thoughts We recently updated our anonymous product survey; we welcome your feedback. Related Advisories Jun 25, 2026 ICS Advisory | ICSMA-26-176-02 OHIF Viewers DICOM Jun 25, 2026 ICS Advisory | ICSA-26-176-03 Horner Automation Cscape Jun 25, 2026 ICS Advisory | ICSA-26-176-04 Daktronics Controller Firmware Jun 25, 2026 ICS Advisory | ICSA-26-176-02 EVoke Systems Charging Station Management System

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