# CVE-2026-34497: FMS Employee Vulnerable to HTML Injection

> An attacker can inject malicious HTML scripts into the FM Systems Employee web application, potentially executing code or stealing user sessions.

- **Severity:** Medium 4.8 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 31 Jul 2026
- **Updated:** 31 Jul 2026
- **Also known as:** GHSA-9hxq-5m48-2w2f

## What is CVE-2026-34497?

CVE-2026-34497 is a medium-severity cross-site scripting vulnerability in Johnson Controls FM Systems Employee, published on 31 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Improper neutralization of Script-Related HTML tags in a web page (basic XSS) vulnerability in Johnson Controls FM Systems Employee allows Cross-Site Scripting (XSS).

This issue affects FM Systems Employee: before 2025.3.1.

Weakness: CWE-80 (Improper Neutralization of Script-Related HTML Tags in a Web Page)

## Which versions are affected by CVE-2026-34497?

It affects 1 product.


Products: Johnsoncontrols Fms Employee.

## How do I fix CVE-2026-34497?

No fix has been published for CVE-2026-34497 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34497 being exploited?

There is no known exploitation of CVE-2026-34497 in the wild and no public exploit code.

## Other vulnerabilities in Johnson Controls FM Systems Employee

- [CVE-2026-21662](https://insights.sbomify.com/CVE-2026-21662/): FMS Employee Allows Upload of Unrestricted Files (medium 4.8)
- [CVE-2026-34495](https://insights.sbomify.com/CVE-2026-34495/): FMS Employee vulnerable to XSS (medium 4.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34497 and fix it if it is affected.

What it is: CVE-2026-34497 is a medium-severity cross-site scripting vulnerability in Johnson Controls FM Systems Employee, published on 31 Jul 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-34497 in the wild and no public exploit code.

Affected product: Johnson Controls FM Systems Employee. 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-2026-34497/ (Markdown: https://insights.sbomify.com/CVE-2026-34497/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34497
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34497
- OSV: https://osv.dev/vulnerability/CVE-2026-34497

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-34497/
Summaries are generated and may contain mistakes; the official description above is the record.