CVE-2026-25951
Published: 09 February 2026
Summary
CVE-2026-25951 is a high-severity Path Traversal (CWE-22) vulnerability in Frangoteam Fuxa. Its CVSS base score is 8.6 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked in the top 35.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).
Deeper analysis
CVE-2026-25951 is a directory traversal vulnerability in FUXA, an open-source web-based Process Visualization (SCADA/HMI/Dashboard) software. In versions prior to 1.2.11, a flaw in the path sanitization logic permits bypassing of directory traversal protections through nested traversal sequences, such as ....//. This allows an attacker to write arbitrary files to the server filesystem, including sensitive directories like runtime/scripts, ultimately enabling remote code execution (RCE) upon server reload of the malicious scripts. The vulnerability is associated with CWEs-22 (Path Traversal), CWE-23 (Relative Path Traversal), and CWE-184 (Incomplete List of Disallowed Inputs) and carries a CVSS v3.1 base score of 7.2 (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H).
An authenticated attacker possessing administrative privileges can exploit this issue over the network with low complexity and no user interaction required. By crafting requests with nested traversal payloads, the attacker bypasses sanitization to upload malicious files into executable directories. When FUXA reloads scripts during runtime, the injected code executes with the privileges of the server process, potentially granting full control over the host system, including high confidentiality, integrity, and availability impacts.
The vulnerability is addressed in FUXA version 1.2.11, where the path sanitization logic was hardened to properly handle nested traversal attempts, as detailed in the project's GitHub security advisory (GHSA-68m5-5w2h-h837), release notes for v1.2.11, and the fixing commit (f7a9f04b2ab97ab5421e4ec4e711c51e9f4b65c8). Security practitioners should upgrade to 1.2.11 or later and review access controls to limit administrative privileges in SCADA/HMI deployments.
OWASP Top 10 for Web (2025)
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-6245
Vulnerability details
FUXA is a web-based Process Visualization (SCADA/HMI/Dashboard) software. Prior to 1.2.11, there is a flaw in the path sanitization logic allows an authenticated attacker with administrative privileges to bypass directory traversal protections. By using nested traversal sequences (e.g., ....//), an…
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attacker can write arbitrary files to the server filesystem, including sensitive directories like runtime/scripts. This leads to Remote Code Execution (RCE) when the server reloads the malicious scripts. This vulnerability is fixed in 1.2.11.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Directory traversal in public-facing FUXA web app enables authenticated arbitrary file write to executable script directories (runtime/scripts), directly facilitating RCE via malicious script execution on server reload, mapping to T1190 (exploitation of the exposed application) and T1100 (web shell/script deployment for code execution).
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Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of file path inputs to reject malformed traversal sequences such as ....// before any write operation occurs.
Mandates timely application of the vendor patch (v1.2.11) that hardens the path sanitization logic against nested traversal bypasses.
Restricts the scope of administrative privileges so that even authenticated admins cannot reach runtime/scripts directories used for RCE.