# CVE-2025-66599: Information disclosure in FAST/TOOLS

> Attackers can view physical file paths on web pages, potentially aiding further attacks against Yokogawa FAST/TOOLS systems.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 9 Feb 2026
- **Updated:** 9 Feb 2026
- **Also known as:** GHSA-pv6p-86wr-j7hp

## What is CVE-2025-66599?

CVE-2025-66599 is a medium-severity vulnerability in Yokogawa Electric Corporation FAST/TOOLS, published on 9 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability has been found in FAST/TOOLS provided by Yokogawa Electric Corporation.

Physical paths could
be displayed on web pages. This information could be exploited by an attacker
for other attacks.

The
affected products and versions are as follows: FAST/TOOLS (Packages: RVSVRN, UNSVRN, HMIWEB, FTEES, HMIMOB) R9.01 to
R10.04

Weakness: CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere)

## Which versions are affected by CVE-2025-66599?


## How do I fix CVE-2025-66599?

No fix has been published for CVE-2025-66599 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-66599 being exploited?

There is no known exploitation of CVE-2025-66599 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-66599 and fix it if it is affected.

What it is: CVE-2025-66599 is a medium-severity vulnerability in Yokogawa Electric Corporation FAST/TOOLS, published on 9 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-66599 in the wild and no public exploit code.

Affected product: Yokogawa Electric Corporation FAST/TOOLS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-66599/ (Markdown: https://insights.sbomify.com/CVE-2025-66599/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-66599
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-66599
- OSV: https://osv.dev/vulnerability/CVE-2025-66599

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-66599/
Summaries are generated and may contain mistakes; the official description above is the record.