What’s Vulnerable › Vulnerabilities

CVE-2026-43947: FUXA Vulnerable to Unauthenticated Remote Code Execution via Script Test Mode Authorization Bypass

• Severity: high (CVSS 8.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-21 · updated 2026-10-24
• Weakness: CWE-863

Description

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Version 1.3.0 has an unauthenticated Remote Code Execution vulnerability when `secureEnabled` is set to `true`. The `POST /api/runscript` endpoint checks authorization against the stored script's permission by ID, but when `test: true` is set in the request, it compiles and executes attacker-supplied code instead of the stored script's code. An unauthenticated attacker who knows a valid script ID and name may execute arbitrary code via test mode if at least one server-side script exists and is accessible without restrictive permissions. Script IDs and names can be obtained through the unauthenticated information disclosure in `GET /api/project` (reported separately). The only prerequisite is that at least one server-side script exists in the project. Version 1.3.1 fixes the issue.

Affected products

• frangoteam FUXA: = 1.3.0

References

• https://github.com/frangoteam/FUXA/commit/78534da61a91613712b44bb63c8d7da8c5df5ca4
• https://github.com/frangoteam/FUXA/pull/2260
• 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

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