CVE-2026-66656 in Foton Core Plugin
Summary
by MITRE • 08/13/2026
Unauthenticated Local File Inclusion in Foton Core <= 1.1.1 versions.
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability identified as unauthenticated local file inclusion in Foton Core versions 1.1.1 and earlier represents a critical security flaw that allows attackers to access arbitrary files on the server filesystem without requiring authentication credentials. This issue stems from inadequate input validation within the application's file handling mechanisms, where user-supplied parameters are directly incorporated into file path constructions without proper sanitization or authorization checks. The vulnerability manifests when applications fail to properly validate and sanitize file access requests, enabling malicious actors to manipulate input parameters to traverse the filesystem and retrieve sensitive information.
This weakness falls under the Common Weakness Enumeration category CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory, commonly known as path traversal attacks. The vulnerability operates by exploiting the lack of proper input validation in file inclusion functions, allowing attackers to append directory traversal sequences such as ../ or ..\ to access files outside the intended directory structure. In the context of Foton Core, this flaw could potentially expose configuration files, database credentials, application source code, and other sensitive data that should remain protected from unauthorized access.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can serve as a stepping stone for more sophisticated attacks within the compromised environment. Attackers can leverage this vulnerability to gain insights into the application's architecture, identify additional vulnerabilities, or extract credentials that could enable further privilege escalation. The lack of authentication requirements makes this attack vector particularly dangerous as it requires no prior access credentials, making detection and prevention more challenging for system administrators.
From a threat modeling perspective, this vulnerability aligns with several MITRE ATT&CK techniques including T1083 (File and Directory Discovery) and T1566 (Phishing). The attack surface is broadened by the fact that multiple components within Foton Core may be vulnerable to this type of exploitation, potentially affecting various subsystems that handle file operations. Organizations using affected versions should consider implementing immediate mitigations such as input validation, proper access controls, and application-level restrictions on file access operations.
The remediation approach for this vulnerability requires comprehensive patching of the Foton Core framework to version 1.1.2 or later, which includes proper input sanitization mechanisms and authentication requirements for file access operations. Additionally, administrators should implement network-level restrictions through firewalls and intrusion detection systems to monitor for suspicious file access patterns. The implementation of web application firewalls with specific rules targeting path traversal attempts can provide an additional layer of defense against exploitation attempts.
Security professionals should also consider conducting thorough code reviews of custom applications built on top of Foton Core to ensure no additional vulnerabilities have been introduced through improper file handling practices. The vulnerability underscores the importance of implementing principle of least privilege in file access operations and maintaining up-to-date security patches across all application components. Organizations should establish monitoring procedures specifically designed to detect anomalous file access patterns that could indicate exploitation attempts, as well as maintain comprehensive backup strategies to ensure rapid recovery from potential compromise scenarios.