FUXA's scheduler API missing admin check enables operator-to-admin escalation via scheduled device actions

## 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

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GitHub Advisory Database · CC-BY-4.0

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

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