VulnerabilityPublished 9 Feb 2026

CVE-2025-66595: Yokogawa Electric FAST/TOOLS · Cross-Site Request Forgery (CSRF)

Affects Yokogawa Electric FAST/TOOLSSource CVE Database V5

Not known to be exploited · CVSS 6.3 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 4.0 base score

6.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

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

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: Present
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: None
Vulnerable system integrity: Low
Vulnerable system availability: None
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: Present: The successful attack depends on the presence of specific deployment and execution conditions of the vulnerable system that enable the attack. These include: a race condition must be won to successfully exploit the vulnerability (the successfulness of the attack is conditioned on execution conditions that are not under full control of the attacker, or the attack may need to be launched multiple times against a single target before being successful); the attacker must inject themselves into the logical network path between the target and the resource requested by the victim (e.g. vulnerabilities requiring an on-path attacker).
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: None: There is no impact to availability within the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 9 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Yokogawa Electric CorporationFAST/TOOLS	Affected ≥ R9.01, ≤ R10.04	Fixed in–

AI-suggested

Apply official patches or updates from Yokogawa Electric Corporation as soon as they become available for FAST/TOOLS versions R9.01 through R10.04.
Implement anti-CSRF tokens in all web forms and state-changing requests within FAST/TOOLS interfaces to ensure requests are legitimate and originate from authenticated sessions.
Enforce strict validation of HTTP headers such as Origin and Referer to detect and block cross-origin requests that could be malicious.
Restrict access to FAST/TOOLS web interfaces to trusted networks and use network segmentation to isolate industrial control systems from general IT networks and the internet.
Employ web application firewalls (WAFs) with rules designed to detect and block CSRF attack patterns targeting industrial control system interfaces.
Educate users and operators about the risks of clicking on unsolicited or suspicious links, especially those that could trigger actions in industrial control systems.
Monitor logs and network traffic for unusual or unauthorized commands that could indicate exploitation attempts.
Consider multi-factor authentication (MFA) for accessing FAST/TOOLS interfaces to add an additional layer of security, even though the vulnerability does not require authentication.
Conduct regular security assessments and penetration testing focused on web interface vulnerabilities in industrial control systems.

Description

CVE-2025-66595 is a Cross-Site Request Forgery (CSRF) vulnerability affecting Yokogawa Electric Corporation's FAST/TOOLS product versions R9.01 through R10.04. This vulnerability allows an attacker to trick authenticated users into executing unwanted actions by accessing a maliciously crafted link, potentially compromising the user's account. The vulnerability does not require user interaction beyond visiting the link and does not require prior authentication. The CVSS 4.0 base score is 6.3, indicating a medium severity level. No known exploits are currently reported in the wild. The affected FAST/TOOLS packages include RVSVRN, UNSVRN, HMIWEB, FTEES, and HMIMOB.

Impact

For European organizations, especially those operating in critical infrastructure sectors such as energy, manufacturing, and utilities, this CSRF vulnerability in FAST/TOOLS could lead to unauthorized commands being executed within industrial control environments. This could disrupt operational processes, cause safety incidents, or lead to data integrity issues. Given the widespread use of Yokogawa's FAST/TOOLS in European industrial environments, exploitation could affect production continuity and safety compliance. The vulnerability’s ability to be triggered without authentication or user interaction increases the risk of automated or targeted attacks. Additionally, compromised user accounts could be leveraged for further lateral movement or privilege escalation within industrial networks. The impact extends beyond confidentiality to integrity and availability of industrial processes, which are critical for operational safety and regulatory compliance in Europe. Organizations may face operational downtime, financial losses, and reputational damage if exploited. The absence of known exploits in the wild provides a window for remediation, but also means attackers could develop exploits targeting these systems.

CWE-352Cross-Site Request Forgery (CSRF) (opens in a new tab)
Compound weaknessLikelihood of exploit: MediumCWE Top 25 (2025): #3OWASP Top 10 A01:2025: Broken Access Control (opens in a new tab)
The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
Architecture and Design · Libraries or Frameworks
Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid.
Implementation
Ensure that the application is free of cross-site scripting issues (CWE-79), because most CSRF defenses can be bypassed using attacker-controlled script.
Architecture and Design
Generate a unique nonce for each form, place the nonce into the form, and verify the nonce upon receipt of the form. Be sure that the nonce is not predictable (CWE-330).
OWASP Cheat Sheets
REST Assessment (opens in a new tab)
REST Security (opens in a new tab)
Cross-Site Request Forgery Prevention (opens in a new tab)
Authorization Testing Automation (opens in a new tab)
Insecure Direct Object Reference Prevention (opens in a new tab)
OWASP ASVS 4.0.3
V13.2.3 (opens in a new tab)
V4.2.2 (opens in a new tab)
V13.3.2 (opens in a new tab)
Attack patterns
JSON Hijacking (aka JavaScript Hijacking) (opens in a new tab)
Cross-Domain Search Timing (opens in a new tab)
Cross Site Identification (opens in a new tab)
Cross Site Request Forgery (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

web-material3.yokogawa.com/1/39206/files/YSAR-26-0001-E.pdf (opens in a new tab)

Community reviews

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 16 Feb 2026, 13:18 UTC

WeaknessesCWE-352

Technical details

References

Community reviews

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