CVE-2026-25939
📋 TL;DR
An authorization bypass vulnerability in FUXA web-based SCADA/HMI software allows unauthenticated remote attackers to create and modify arbitrary schedulers. This affects FUXA versions 1.2.8 through 1.2.10, potentially exposing connected industrial control systems to unauthorized manipulation. Organizations using vulnerable FUXA installations for process visualization are at risk.
💻 Affected Systems
- FUXA
📦 What is this software?
Fuxa by Frangoteam
⚠️ Risk & Real-World Impact
Worst Case
Attackers could manipulate industrial processes by creating malicious schedulers, potentially causing physical damage, production disruption, or safety incidents in connected ICS/SCADA environments.
Likely Case
Attackers gain unauthorized access to modify scheduler configurations, potentially disrupting operations, altering process visualizations, or establishing persistence for future attacks.
If Mitigated
With proper network segmentation and access controls, impact is limited to the FUXA application layer without affecting underlying industrial processes.
🎯 Exploit Status
The vulnerability allows unauthenticated access to scheduler functionality, making exploitation straightforward for attackers with network access.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.11
Vendor Advisory: https://github.com/frangoteam/FUXA/security/advisories/GHSA-c869-jx4c-q5fc
Restart Required: Yes
Instructions:
1. Backup current FUXA configuration and data. 2. Download FUXA version 1.2.11 from GitHub releases. 3. Stop the FUXA service. 4. Replace the installation with version 1.2.11. 5. Restart the FUXA service. 6. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to FUXA web interface to trusted IP addresses only
Reverse Proxy Authentication
allPlace FUXA behind a reverse proxy with additional authentication layer
🧯 If You Can't Patch
- Implement strict network segmentation to isolate FUXA from production ICS networks
- Deploy web application firewall rules to block unauthorized scheduler API calls
🔍 How to Verify
Check if Vulnerable:
Check FUXA version via web interface or configuration files. If version is between 1.2.8 and 1.2.10 inclusive, system is vulnerable.Check Version:
Check FUXA web interface dashboard or examine package.json/version files in installation directoryVerify Fix Applied:
Confirm FUXA version is 1.2.11 or later and test that unauthenticated users cannot access scheduler creation/modification endpoints.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated requests to scheduler API endpoints
- Multiple failed authentication attempts followed by scheduler modifications
- Scheduler creation/modification from unexpected IP addresses
Network Indicators:
- HTTP POST/PUT requests to /api/scheduler* endpoints without authentication headers
- Unusual scheduler-related API traffic patterns
SIEM Query:
source="fuxa" AND (uri_path="/api/scheduler" OR uri_path="/api/schedulers") AND http_status=200 AND NOT auth_token=*