# CVE-2026-43947: frangoteam FUXA unauthenticated RCE in /api/runscript

Source: https://junglewise.ai/threats/cve-2026-43947-frangoteam-fuxa-unauthenticated-rce-in-api-runscript  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-21. Updated: 2026-07-21  
License: CC BY 4.0 with a link back

CVE-2026-43947 · Severity: high · CVSS 4 · Published 2026-07-21

FUXA is a web-based industrial control and dashboard platform used to visualize and manage industrial processes. A security flaw allows an unauthenticated attacker to bypass security checks and execute arbitrary commands on the server. This could lead to a total takeover of the system, unauthorized access to industrial equipment, and theft of sensitive operational data.

Technologies: [Frangoteam FUXA](https://junglewise.ai/threats/technologies/fuxa), [fuxa-server (npm)](https://junglewise.ai/threats/technologies/fuxa-server). Vendors: [Frangoteam](https://junglewise.ai/threats/vendors/frangoteam), [npm](https://junglewise.ai/threats/vendors/npm).

## Quick answers

**Is CVE-2026-43947 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-43947 being exploited in the wild.

**How severe is CVE-2026-43947?** High severity, with a CVSS score of 4, published 21 July 2026.

**Which products and versions are affected?** Frangoteam FUXA 1.3.0; fuxa-server (npm) = 1.3.0, SEMVER:introduced=1.3.0,fixed=1.3.1.

**Is there a fix for CVE-2026-43947?** Yes. fuxa-server (npm): upgrade to 1.3.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-43947 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-43947?** Check whether you run Frangoteam FUXA or fuxa-server (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- fuxa-server (npm): upgrade to 1.3.1 or later

  ```sh
  npm install fuxa-server@1.3.1
  ```


## Technical details

An unauthenticated remote code execution (RCE) vulnerability exists in FUXA version 1.3.0 due to an authorization bypass in the script execution engine. The `POST /api/runscript` endpoint validates permissions against a stored script's ID; however, if the `test: true` flag is included in the request, the server executes attacker-supplied code instead of the stored script. Because the middleware automatically assigns a guest token to unauthenticated requests and scripts without explicit permissions default to being accessible, an attacker can leverage a known script ID (obtainable via information disclosure) to execute arbitrary Node.js code. The vulnerability allows full access to the underlying operating system via the `child_process` module. This issue is resolved in version 1.3.1.

## Affected products

- frangoteam FUXA 1.3.0

## Identifiers

- CVE-2026-43947
- GHSA-rg3m-cfq7-g6h6

## Timeline

- 2026-03-19: patched: Fix merged into master branch
- 2026-04-09: other: Version 1.3.1 released
- 2026-05-19: advisory: GitHub Security Advisory published
- 2026-07-21: disclosed: CVE published to NVD

## References

- [https://github.com/frangoteam/FUXA/commit/78534da61a91613712b44bb63c8d7da8c5df5ca4](https://github.com/frangoteam/FUXA/commit/78534da61a91613712b44bb63c8d7da8c5df5ca4)
- [https://github.com/frangoteam/FUXA/pull/2260](https://github.com/frangoteam/FUXA/pull/2260)
- [https://github.com/frangoteam/FUXA/releases/tag/v1.3.1](https://github.com/frangoteam/FUXA/releases/tag/v1.3.1)
- [https://github.com/frangoteam/FUXA/security/advisories/GHSA-rg3m-cfq7-g6h6](https://github.com/frangoteam/FUXA/security/advisories/GHSA-rg3m-cfq7-g6h6)

## Related threats

- [FUXA authorization bypass in /api/runscript](https://junglewise.ai/threats/cve-2026-42949-a-authorization-bypass-vulnerability-exists-in-the-api-runscript)
- [FUXA /nodered authorization bypass to RCE](https://junglewise.ai/threats/cve-2026-42922-a-authorization-bypass-vulnerability-exists-in-the-nodered)
- [FUXA information disclosure in Node-RED scripts endpoint](https://junglewise.ai/threats/cve-2026-40063-a-information-disclosure-vulnerability-exists-in-the-nodered-fuxa)
- [FUXA unauthenticated information disclosure in Socket.IO handlers](https://junglewise.ai/threats/cve-2026-67440-fuxa-unauthenticated-information-disclosure-in-socket-io-handlers)
- [Frangoteam FUXA privilege escalation in Scheduler API](https://junglewise.ai/threats/cve-2026-47721-frangoteam-fuxa-privilege-escalation-in-scheduler-api)