CVE-2026-25751: 
JavaScript vulnerability analysis and mitigation

CVE-2026-25751 is an information disclosure vulnerability in FUXA, a web-based Process Visualization (SCADA/HMI/Dashboard) software developed by frangoteam. It allows an unauthenticated, remote attacker to retrieve sensitive administrative database credentials, including plaintext InfluxDB credentials, from the full system configuration. All versions through 1.2.9 are affected, including deployments with runtime.settings.secureEnabled set to true. The vulnerability was published on February 6, 2026, and patched in version 1.2.10. It carries a CVSS v3.1 base score of 7.5 (High) and a CVSS v4.0 base score of 9.1 (Critical) (GitHub Advisory, Red Hat CVE).

The vulnerability is rooted in two weaknesses: CWE-306 (Missing Authentication for Critical Function) and CWE-312 (Cleartext Storage of Sensitive Information). FUXA exposes a system configuration endpoint or function that does not enforce authentication, allowing any remote attacker to retrieve the full configuration data without credentials. This configuration data contains InfluxDB administrative credentials stored in cleartext, meaning no decryption or privilege escalation is required to use them. The flaw persists even when the secureEnabled setting is active, indicating the authentication bypass is not gated by the application's security mode (GitHub Advisory). The fix in v1.2.10 addressed an authentication bypass related to heartbeat token refresh and improved protection of sensitive DAQ store credentials (FUXA v1.2.10 Release).

Successful exploitation enables an unauthenticated remote attacker to obtain the complete FUXA system configuration, including plaintext administrative credentials for the InfluxDB database. With these credentials, an attacker can directly authenticate to the InfluxDB service to read, modify, or delete all historical process data stored by the SCADA/HMI system, undermining operational data integrity. Additionally, an attacker could corrupt the database to cause a Denial of Service, disrupting industrial process monitoring and control operations that depend on data availability (GitHub Advisory).

As of the time of reporting, there is no public proof-of-concept exploit and no evidence of in-the-wild exploitation (Feedly). The vulnerability requires no authentication, no user interaction, and low attack complexity, making it trivially exploitable by any remote attacker who can reach the FUXA web interface. The EPSS score is approximately 0.049% (0.000490), indicating a currently low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been reported.

1. Reconnaissance: Identify internet-facing or network-accessible FUXA instances (versions ≤ 1.2.9) using tools like Shodan, Censys, or network scanning (e.g., nmap), searching for the FUXA web interface (typically on port 1881 or configured HTTP port).
2. Access unauthenticated configuration endpoint: Send an unauthenticated HTTP GET or POST request to the FUXA configuration or system settings endpoint that lacks proper authentication enforcement — this endpoint exposes the full system configuration without requiring credentials.
3. Extract plaintext credentials: Parse the returned configuration data to extract the InfluxDB administrative username and password, which are stored and transmitted in cleartext.
4. Authenticate to InfluxDB: Use the extracted credentials to authenticate directly to the InfluxDB service (typically on port 8086) using the InfluxDB CLI, HTTP API, or a client tool (e.g., curl -u admin:password http://<target>:8086/query).
5. Achieve objective: Read, modify, or delete historical SCADA/HMI process data, or corrupt the database to cause a Denial of Service affecting operational systems (GitHub Advisory).

• Network: Unauthenticated HTTP requests to FUXA configuration or settings API endpoints from unexpected source IPs; outbound connections from the FUXA host to external IPs on InfluxDB port (8086) or other unusual ports.
• Logs: FUXA access logs showing requests to system configuration endpoints without valid authentication tokens or session cookies; InfluxDB access logs showing authentication events from IP addresses not associated with legitimate FUXA server processes.
• File System: No specific file artifacts expected from credential theft alone; however, unexpected InfluxDB data exports or deletions may indicate post-exploitation activity.
• Process/Behavior: Unusual InfluxDB query activity (bulk reads, data deletions, or schema modifications) originating from non-FUXA source IPs; unexpected InfluxDB service restarts or database corruption errors in logs.

The primary remediation is to upgrade FUXA to version 1.2.10 or later, which fixes the authentication bypass and hardens sensitive credential storage (FUXA v1.2.10 Release, GitHub Advisory). If immediate patching is not possible, implement network-level access controls (firewall rules, VPN) to restrict access to the FUXA web interface to trusted hosts only. Additionally, segment the FUXA and InfluxDB systems from untrusted networks, rotate InfluxDB administrative credentials after patching, and monitor database access logs for unauthorized activity.

The vulnerability was reported by researcher 'wodzen' and published as a GitHub Security Advisory by the FUXA maintainer 'unocelli' on February 4–6, 2026 (GitHub Advisory). A brief mention was noted on Mastodon via TheHackerWire. No significant broader media coverage or notable researcher commentary beyond the advisory has been identified.