CVE-2026-25751: Fuxa Information Disclosure Vulnerability

CVE-2026-25751 Overview

CVE-2026-25751 is an information disclosure vulnerability in FUXA, a web-based Process Visualization platform used for SCADA, HMI, and dashboard deployments. The flaw allows an unauthenticated, remote attacker to retrieve the full system configuration, including administrative credentials for the backing InfluxDB time-series database. The vulnerability affects FUXA through version 1.2.9 and is patched in version 1.2.10. It is classified under CWE-306: Missing Authentication for Critical Function.

Critical Impact

Unauthenticated attackers can extract InfluxDB administrative credentials from FUXA, enabling them to read, modify, or delete historical process data and disrupt operational technology environments.

Affected Products

• Frangoteam FUXA versions through 1.2.9
• FUXA deployments exposing the configuration endpoint to untrusted networks
• Connected InfluxDB instances reachable using exposed administrative credentials

Discovery Timeline

• 2026-02-06 - CVE-2026-25751 published to NVD
• 2026-02-10 - Last updated in NVD database
• FUXA v1.2.10 - Frangoteam releases patched version via the GitHub FUXA Release v1.2.10

Technical Details for CVE-2026-25751

Vulnerability Analysis

FUXA exposes a system configuration resource that returns sensitive deployment data without enforcing authentication. A remote attacker who can reach the FUXA web service over the network can retrieve the configuration payload, which contains the connection parameters and administrative credentials for the connected InfluxDB database.

Because SCADA and HMI platforms typically run inside operational technology networks, leaked database credentials extend the attacker's reach beyond the visualization layer. With InfluxDB administrative access, an adversary can query historical process data, alter measurements that drive operator decisions, or destroy retention buckets to cause a denial of service. Tampering with process telemetry can also mask physical attacks on industrial equipment.

Root Cause

The root cause is missing authentication on a critical function [CWE-306]. The endpoint responsible for serving FUXA's system configuration does not validate session state or identity before responding, returning secrets that should require administrator authorization to access.

Attack Vector

The vulnerability is exploitable over the network with low attack complexity and no privileges or user interaction. An attacker issues an HTTP request to the unauthenticated configuration endpoint on a reachable FUXA instance and parses the returned JSON for the embedded InfluxDB credentials. The attacker then authenticates directly to the InfluxDB service using those credentials. No verified public proof-of-concept code is referenced in the advisory; technical specifics are documented in the GitHub Security Advisory GHSA-c5gq-4h56-4mmx.

Detection Methods for CVE-2026-25751

Indicators of Compromise

• Unauthenticated HTTP requests to FUXA configuration or settings endpoints from external or unexpected internal sources
• InfluxDB authentication events originating from IP addresses outside of the FUXA application server
• Unexpected DROP, DELETE, or retention policy modifications in InfluxDB audit logs

Detection Strategies

• Inspect FUXA web server access logs for anonymous GET requests targeting configuration routes and large JSON responses returned without a session cookie
• Correlate InfluxDB administrative logins with the source IPs of authorized FUXA hosts and alert on deviations
• Baseline normal SCADA-to-database query patterns and flag bulk reads or schema changes outside maintenance windows

Monitoring Recommendations

• Forward FUXA and InfluxDB logs to a centralized analytics platform and retain them for incident investigation
• Monitor north-south and east-west traffic to OT segments hosting FUXA for unauthorized HTTP polling
• Track FUXA version inventory across sites to identify hosts still running 1.2.9 or earlier

How to Mitigate CVE-2026-25751

Immediate Actions Required

• Upgrade all FUXA installations to version 1.2.10 or later as published in the GitHub FUXA Release v1.2.10
• Rotate any InfluxDB administrative credentials previously stored in FUXA configurations, assuming they are compromised
• Restrict network access to FUXA management interfaces using firewalls and ACLs so only authorized operators can reach them

Patch Information

Frangoteam fixed CVE-2026-25751 in FUXA 1.2.10. The fix and advisory details are published in the GitHub Security Advisory GHSA-c5gq-4h56-4mmx. Administrators should review release notes before deploying and validate that the configuration endpoint requires authentication after upgrade.

Workarounds

• Place FUXA behind a reverse proxy that enforces authentication on all routes until the upgrade is applied
• Isolate FUXA and its InfluxDB backend on a dedicated OT network segment with no direct internet exposure
• Replace shared InfluxDB administrative accounts with least-privilege service accounts scoped to required databases

# Example: restrict FUXA web access to a trusted management subnet using iptables
iptables -A INPUT -p tcp --dport 1881 -s 10.20.30.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 1881 -j DROP

# Example: rotate the InfluxDB admin password after upgrading FUXA
influx user password -n admin