Critical severity · published Feb 9, 2026
CVE-2025-66606
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
9.6
CVSS
0.3%
EPSS
No
On KEV
Description
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.
This product does not
properly encode URLs. An attacker could tamper with web pages or execute
malicious scripts.
The
affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to
R10.04
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 17% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FA
FAST/TOOLS · Yokogawa Electric Corporation
R9.01 through R10.04 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66606
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66606
Vendor Advisory
https://web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf
More from FAST/TOOLS
9.8
CVE-2025-66602
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
9.8
CVE-2025-66603
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
8.8
CVE-2025-66600
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation
8.2
CVE-2026-11833
Overview: A vulnerability has been found in FAST/TOOLS and CI Server
7.5
CVE-2025-66597
A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation