# CVE-2026-11833: Information disclosure in CI Server

> An attacker can retrieve sensitive CI Server configuration information from the web server, potentially aiding further attacks on Yokogawa industrial systems.

- **Severity:** High 8.2 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jun 2026
- **Updated:** 23 Jun 2026
- **Also known as:** GHSA-4852-997v-4274

## What is CVE-2026-11833?

CVE-2026-11833 is a high-severity vulnerability in Yokogawa Electric Corporation CI Server, published on 23 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Overview: 
A vulnerability has been found in FAST/TOOLS and CI Server. The web server may return a response containing the CI Server setting information. 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

CI Server (All packages) R1.01 to R1.04

Weakness: CWE-319 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2026-11833?


## How do I fix CVE-2026-11833?

No fix has been published for CVE-2026-11833 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-11833 being exploited?

There is no known exploitation of CVE-2026-11833 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-11833 and fix it if it is affected.

What it is: CVE-2026-11833 is a high-severity vulnerability in Yokogawa Electric Corporation CI Server, published on 23 Jun 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-2026-11833 in the wild and no public exploit code.

Affected product: Yokogawa Electric Corporation CI Server. 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-2026-11833/ (Markdown: https://insights.sbomify.com/CVE-2026-11833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-11833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-11833
- OSV: https://osv.dev/vulnerability/CVE-2026-11833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-11833/
Summaries are generated and may contain mistakes; the official description above is the record.