FUXA: Scheduler API missing admin check enables operator-to-admin escalation via scheduled device actions

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FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.3.2, POST /api/scheduler and DELETE /api/scheduler in server/api/scheduler/index.js do not consistently enforce authJwt.haveAdminPermission for scheduler settings. An authenticated non-admin operator can create or alter deviceActions that invoke onSetValue or onRunScript, or delete schedules, gaining access to device-value changes and server-side project script execution normally reserved for administrators. Scheduled and repeating actions can continue changing PLC setpoints, safety interlocks, device state, or project data after the operator's session ends. This issue is fixed in version 1.3.2.

Source published

18 Aug 2026 20:00:19 UTC

Source modified

19 Aug 2026 15:21:35 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

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CVSS 3.1 · 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.3.2, POST /api/scheduler and DELETE /api/scheduler in server/api/scheduler/index.js do not consistently enforce authJwt.haveAdminPermission for scheduler settings. An authenticated non-admin operator can create or alter deviceActions that invoke onSetValue or onRunScript, or delete schedules, gaining access to device-value changes and server-side project script execution normally reserved for administrators. Scheduled and repeating actions can continue changing PLC setpoints, safety interlocks, device state, or project data after the operator's session ends. This issue is fixed in version 1.3.2.

Source published

Aug 18, 2026, 8:00:19 PM (timezone not stated)

Source modified

Aug 19, 2026, 3:21:35 PM (timezone not stated)

Observed here

7 Nov 2026 11:28:01 UTC

Source terms

ENISA EUVD · source terms and attribution apply

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.3.2, POST /api/scheduler and DELETE /api/scheduler in server/api/scheduler/index.js do not consistently enforce authJwt.haveAdminPermission for scheduler settings. An authenticated non-admin operator can create or alter deviceActions that invoke onSetValue or onRunScript, or delete schedules, gaining access to device-value changes and server-side project script execution normally reserved for administrators. Scheduled and repeating actions can continue changing PLC setpoints, safety interlocks, device state, or project data after the operator's session ends. This issue is fixed in version 1.3.2.

Source published

18 Aug 2026 20:17:15 UTC

Source modified

22 Oct 2026 22:10:00 UTC

Observed here

25 Oct 2026 12:17:26 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 3.1 · [email protected] · Secondary · 6.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

## Summary 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. ## Impact 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. ## Recommended Fix 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`. ```javascript 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](https://aisafe.io)*

Source published

8 Jun 2026 23:07:02 UTC

Source modified

8 Jun 2026 23:26:35 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Publisher rating · MODERATE