CVE-2026-25895
📋 TL;DR
CVE-2026-25895 is a path traversal vulnerability in FUXA web-based SCADA/HMI software that allows unauthenticated remote attackers to write arbitrary files anywhere on the server filesystem. This affects all FUXA installations through version 1.2.9. The vulnerability enables complete server compromise through file overwrite attacks.
💻 Affected Systems
- FUXA
📦 What is this software?
Fuxa by Frangoteam
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise via arbitrary file write leading to remote code execution, data destruction, or persistent backdoor installation
Likely Case
Unauthenticated attackers gain full control of the FUXA server, potentially compromising the entire host system
If Mitigated
Limited impact if server runs with minimal privileges and filesystem permissions restrict write access
🎯 Exploit Status
Path traversal vulnerabilities are typically easy to exploit; advisory suggests straightforward exploitation
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.2.10
Vendor Advisory: https://github.com/frangoteam/FUXA/security/advisories/GHSA-88qh-cphv-996c
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Download FUXA v1.2.10 from GitHub releases. 3. Stop FUXA service. 4. Replace existing installation with v1.2.10. 5. Restart FUXA service. 6. Verify version and functionality.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to FUXA to trusted IP addresses only
iptables -A INPUT -p tcp --dport [FUXA_PORT] -s [TRUSTED_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport [FUXA_PORT] -j DROP
Reverse Proxy with Path Validation
allDeploy a reverse proxy that validates and sanitizes file paths before forwarding to FUXA
🧯 If You Can't Patch
- Isolate FUXA server in separate network segment with strict firewall rules
- Run FUXA with minimal OS privileges and implement strict filesystem permissions
🔍 How to Verify
Check if Vulnerable:
Check FUXA version; if version is 1.2.9 or earlier, system is vulnerableCheck Version:
Check FUXA web interface or configuration files for version informationVerify Fix Applied:
Verify FUXA version is 1.2.10 or later and test that file write operations properly validate paths📡 Detection & Monitoring
Log Indicators:
- Unusual file write operations
- Path traversal patterns in request logs
- Requests with '../' sequences
Network Indicators:
- Unusual file upload patterns
- Requests attempting to access system directories
SIEM Query:
source="fuxa.logs" AND ("../" OR "..\\" OR "%2e%2e%2f")