CVE-2026-64947 in Pandora FMS
Summary
by MITRE • 10/01/2026
A chained CSRF bypass and unrestricted file upload vulnerability in the Plugin File Manager allows an attacker to upload and execute arbitrary PHP code, resulting in Remote Code Execution. This issue affects Pandora FMS: from 777 onwards.
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Analysis
by VulDB Data Team • 10/01/2026
The identified security flaw represents a critical combination of Cross-Site Request Forgery (CSRF) weaknesses and insufficient input validation within the Plugin File Manager component of Pandora FMS versions starting from build 777. This vulnerability allows an authenticated attacker to bypass standard session verification mechanisms, thereby tricking the application into performing state-changing operations without the user's explicit intent or knowledge. The core technical deficiency lies in the absence of robust anti-CSRF tokens or strict origin validation checks during file upload requests, which are essential for ensuring that actions originate from legitimate sources within the same context as the authenticated session.
The operational impact is severe due to the unrestricted nature of the file upload functionality associated with this flaw. Once an attacker successfully exploits the CSRF bypass, they can upload arbitrary files directly to the server's web-accessible directories without adequate sanitization or restriction on file types and extensions. By crafting a malicious payload that mimics legitimate PHP scripts, the attacker achieves Remote Code Execution (RCE). This means that any code uploaded through this vector will be interpreted and executed by the underlying PHP engine running under the privileges of the web server process.
This scenario aligns with CWE-352, which describes Cross-Site Request Forgery vulnerabilities where an application fails to verify the origin or intent of a request, leading to unauthorized state changes. Furthermore, it relates closely to CWE-434 regarding Unrestricted Upload of File with Dangerous Type and CWE-94 for Improper Control of Generation of Code (Code Injection). The exploitation path is consistent with MITRE ATT&CK technique T1505.003, which involves Server Side Web Shell components, as the uploaded PHP file typically functions as a web shell providing persistent access to the compromised system.
The consequences of successful exploitation are extensive and potentially catastrophic for organizational security posture. An attacker gaining RCE through this vector can read sensitive configuration files containing database credentials or API keys, modify application data to facilitate further attacks such as SQL injection or privilege escalation, and pivot into other internal network segments if the web server has broader connectivity than intended. In many enterprise environments, Pandora FMS handles critical infrastructure monitoring data, making unauthorized access a significant risk for operational continuity and data integrity.
Mitigation strategies must address both the immediate technical flaw and the underlying architectural weaknesses. The most effective remediation is to apply the official patch provided by the vendor for versions of Pandora FMS affected by this issue, as it likely includes fixes for CSRF token implementation and stricter file upload validation logic. In cases where immediate patching is not feasible, administrators should implement web application firewall rules that block requests containing suspicious PHP code patterns in file uploads or restrict access to the Plugin File Manager interface based on IP whitelisting if possible. Additionally, ensuring that the web server process runs with minimal privileges and isolating upload directories from executable script execution can significantly reduce the blast radius of such vulnerabilities. Regular security audits focusing on input validation and session management practices are also recommended to prevent similar issues in other components of the application ecosystem.