CVE-2026-47721

An authorization issue in the Scheduler API allowed authenticated non-admin users to create or modify scheduled actions that should be restricted to administrators.

Details

The Scheduler API did not correctly enforce administrator permissions when processing scheduler modifications.

As a result, authenticated users with non-administrative roles could create or modify scheduled actions that execute privileged operations, including device value changes and server-side script execution.

The issue was fixed in version 1.3.2 by enforcing the appropriate permission checks for scheduler modifications.

An operator-level user in FUXA reaches the PLC-write and server-side-script-execution surface that the platform otherwise restricts to administrators. In a SCADA deployment those two privileges cover setpoint control and the automation scripting engine. Alice schedules a job that rewrites a pump's enable tag, opens a safety interlock, or runs a project script that walks the device tree. The scheduled-action model extends the attack: Alice does not need to keep a session open for the action to fire, and a repeating schedule re-applies her changes every cycle even if an admin reverts them manually.

CVSS 3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L (Medium, 6.3). CWE-862.

The application does not perform an authorization check before performing a sensitive operation. Typical impact: unauthorized access to restricted functionality or data.

CVE-2026-47721 has a CVSS score of 6.3 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. No fixed version is listed yet, so configuration controls and monitoring matter more in the interim.

Kodem intelligence

Add authJwt.haveAdminPermission(permission) to both POST /api/scheduler and DELETE /api/scheduler, matching every other write endpoint that reaches runtime.devices.setTagValue or runtime.scriptsMgr.runScript.

schedulerApp.post("/api/scheduler", secureFnc, function(req, res) {
    if (res.statusCode === 403) {
        runtime.logger.error("api post scheduler: Tocken Expired");
        return;
    }
    const permission = checkGroupsFnc(req);
    const isGuest = authJwt.isGuestUser(req.userId, req.userGroups);
    if (runtime.settings?.secureEnabled && (isGuest || !authJwt.haveAdminPermission(permission))) {
        res.status(401).json({error:"unauthorized_error", message: "Unauthorized!"});
        runtime.logger.error("api post scheduler: admin permission required");
        return;
    }
    // ... rest unchanged ...
});

Apply the same change to the delete handler at server/api/scheduler/index.js:102-112. As defense in depth, the scheduler service should also validate each deviceActions entry against the creator's stored groups before execution (e.g., reject onRunScript on any scheduler whose author is not an admin at execution time).

A fix is available at https://github.com/frangoteam/FUXA/releases/tag/v1.3.2.

Found by aisafe.io

1. What is CVE-2026-47721? CVE-2026-47721 is a medium-severity missing authorization vulnerability in fuxa-server (npm), affecting versions <= 1.1.14-1243. No fixed version is listed yet. The application does not perform an authorization check before performing a sensitive operation.
2. How severe is CVE-2026-47721? CVE-2026-47721 has a CVSS score of 6.3 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of fuxa-server are affected by CVE-2026-47721? fuxa-server (npm) versions <= 1.1.14-1243 is affected.
4. Is there a fix for CVE-2026-47721? No fixed version is listed for CVE-2026-47721 yet. Monitor the advisory for updates and apply mitigations in the interim.
5. Is CVE-2026-47721 exploitable, and should I be worried? Whether CVE-2026-47721 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-47721 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-47721? No fixed version is listed yet. In the interim: Keep the dependency up to date. Ensure authorization checks are enforced consistently on all sensitive operations.