CVE-2026-25939: Fuxa server FUXA Unauthenticated Remote Arbitrary Scheduler Vulnerability

CRITICAL
Advisory Identifier: GHSA-c869-jx4c-q5fc
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CWE-862
Published
Advisory Summary

CVE-2026-25939 is a CRITICAL fuxa unauthenticated remote arbitrary scheduler vulnerability (CWE-862: Missing Authorization) affecting Fuxa server libraries in the npm ecosystem. The issue involves fuxa unauthenticated remote arbitrary scheduler write. Remediation is available by upgrading affected packages to version 1.2.11.

CVE-2026-25939 at a Glance

CVE Identifier CVE-2026-25939
GHSA Identifier GHSA-c869-jx4c-q5fc
Severity CRITICAL
CVSS v3.1 Base Score N/A
CWE Classification CWE-862: Missing Authorization
Affected Product Fuxa server
Package Ecosystem npm
Published Date
Last Updated

How to Fix CVE-2026-25939

To remediate this vulnerability, upgrade all affected Fuxa server dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

fuxa-server fixed: 1.2.11 
npm install fuxa-server@1.2.11
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls fuxa-server

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-25939, inspect your project dependencies using npm:

npm ls fuxa-server

Analyze the terminal output to locate any version of Fuxa server in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.2.11), your application is affected.

Note: The npm ls fuxa-server command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In Fuxa server, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Summary An authorization bypass vulnerability in the FUXA allows an unauthenticated, remote attacker to create and modify arbitrary schedulers, exposing connected ICS/SCADA environments to follow-on actions. This vulnerability affects FUXA version 1.2.8 through version 1.2.10. This has been patched in FUXA version 1.2.11. ### Impact This affects all deployments, including those with `runtime.settings.secureEnabled` set to `true`. Exploitation allows an unauthenticated, remote attacker to automatically authenticate as guest and create, modify or delete schedules. These schedules can be configured to trigger immediately or cyclically, forcing connected devices to specific states or values, or executing existing scripts on the server. ### Patches This issue has been patched in FUXA version 1.2.11. Users are strongly encouraged to update to the latest available release.

CVE-2026-25939 Affected Fuxa server Versions

1 component(s)
Fixed Versions:
1.2.11
Product / Package Ecosystem Affected Versions Fixed Version
fuxa-server
npm/fuxa-server
npm
≥ 1.2.8
< 1.2.11
1.2.11

References

GitHub Advisory / Wiki ADVISORY
https://github.com/frangoteam/FUXA/security/advisories/GHSA-c869-jx4c-q5fc
NVD — CVE-2026-25939 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-25939
Fuxa server Source Repository REPOSITORY
https://github.com/frangoteam/FUXA/pull/2174
Security Fix Commit FIX COMMIT
https://github.com/frangoteam/FUXA/commit/5782b35117a9bd14ffcb881f8dfb8c6680157d9b
Security Fix Commit FIX COMMIT
https://github.com/frangoteam/FUXA/commit/aced6ad0b6089eea4e5cef51c0a88bf4f308d45f
Fuxa server Source Repository REPOSITORY
https://github.com/frangoteam/FUXA
Fuxa server Release RELEASE
https://github.com/frangoteam/FUXA/releases/tag/v1.2.11

Frequently Asked Questions

What is CVE-2026-25939?
CVE-2026-25939 is a security vulnerability in Fuxa server involving FUXA Unauthenticated Remote Arbitrary Scheduler Write under CWE-862: Missing Authorization.
Which Fuxa server versions are affected?
Affected versions include releases prior to 1.2.11 across affected packages: fuxa-server.
What version fixes CVE-2026-25939?
Upgrading to 1.2.11 (or the latest patched release for your respective branch) resolves the vulnerability.
Is fuxa-server affected?
Yes, fuxa-server is affected in releases prior to 1.2.11. Upgrade your dependency to 1.2.11 or later.
What CWE is associated with CVE-2026-25939?
CVE-2026-25939 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check npm dependencies for CVE-2026-25939?
Run the dependency tree command: 'npm ls fuxa-server'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-c869-jx4c-q5fc",
  "modified" : "2026-02-10T02:56:59Z",
  "published" : "2026-02-10T00:28:28Z",
  "aliases" : [ "CVE-2026-25939" ],
  "summary" : "FUXA Unauthenticated Remote Arbitrary Scheduler Write",
  "details" : "### Summary\nAn authorization bypass vulnerability in the FUXA allows an unauthenticated, remote attacker to create and modify arbitrary schedulers, exposing connected ICS/SCADA environments to follow-on actions. This vulnerability affects FUXA version 1.2.8 through version 1.2.10. This has been patched in FUXA version 1.2.11.\n\n### Impact\nThis affects all deployments, including those with `runtime.settings.secureEnabled` set to `true`.\n\nExploitation allows an unauthenticated, remote attacker to automatically authenticate as guest and create, modify or delete schedules. These schedules can be configured to trigger immediately or cyclically, forcing connected devices to specific states or values, or executing existing scripts on the server.\n\n### Patches\n\nThis issue has been patched in FUXA version 1.2.11. Users are strongly encouraged to update to the latest available release.",
  "severity" : [ {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "fuxa-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "1.2.8"
      }, {
        "fixed" : "1.2.11"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/frangoteam/FUXA/security/advisories/GHSA-c869-jx4c-q5fc"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-25939"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/frangoteam/FUXA/pull/2174"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/frangoteam/FUXA/commit/5782b35117a9bd14ffcb881f8dfb8c6680157d9b"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/frangoteam/FUXA/commit/aced6ad0b6089eea4e5cef51c0a88bf4f308d45f"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/frangoteam/FUXA"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/frangoteam/FUXA/releases/tag/v1.2.11"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-02-10T00:28:28Z",
    "nvd_published_at" : "2026-02-09T23:16:06Z"
  }
}