CVE-2026-67073 in BigFix AEX
Summary
by MITRE • 10/28/2026
HCL BigFix AEX is affected by an Unrestricted File Upload and Improper Access Control vulnerability. This could allow an attacker to upload malicious or unauthorized files and directly access or download sensitive uploaded content, potentially leading to information disclosure, unauthorized access, or system compromise.
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Analysis
by VulDB Data Team • 10/28/2026
The identified vulnerability in HCL BigFix AEX represents a critical failure in input validation and authorization mechanisms, specifically manifesting as both an Unrestricted File Upload and Improper Access Control flaw. This dual nature of the defect allows attackers to bypass standard security controls that are typically designed to prevent the ingestion of malicious payloads or restrict access to sensitive system resources. The core technical issue lies in the application's inability to properly sanitize file inputs during the upload process, combined with a lack of strict enforcement on who can retrieve or view these uploaded assets. This combination creates a significant attack surface where an adversary can not only introduce harmful code into the environment but also exfiltrate data that was previously stored within the system.
From a technical perspective, the unrestricted file upload component suggests that the application does not adequately verify the type, content, or origin of files submitted by users. In many web-based applications, this often involves failing to check MIME types against allowed extensions, neglecting to validate file signatures, or allowing directory traversal sequences in filenames. When coupled with improper access control, it implies that once a file is successfully uploaded, there are no sufficient checks to ensure that only authorized personnel can download or view its contents. This means that any authenticated user, and potentially unauthenticated users depending on the specific endpoint configuration, could retrieve sensitive files such as configuration data, internal logs, or other proprietary information stored in accessible directories.
The operational impact of this vulnerability is severe and multifaceted. The most immediate risk is system compromise through remote code execution if an attacker uploads a web shell or another executable payload that can be triggered by the server environment. Beyond direct exploitation for control, the improper access control aspect leads to significant information disclosure risks. Sensitive data such as database credentials, internal network maps, customer personal identifiable information, or intellectual property could be downloaded and leaked. This breach of confidentiality undermines trust in the platform and may violate regulatory compliance requirements regarding data protection and privacy.
This vulnerability aligns with CWE-434 Unrestricted Upload of File with Dangerous Type and CWE-285 Improper Authorization within the Common Weakness Enumeration framework. In terms of offensive security tactics, it maps to ATT&CK technique T1505.003 Web Shell, which describes the placement of a web-based tool for persistent access, as well as T1530 Data from Information Repositories, covering the exfiltration of data stored in cloud or on-premise repositories. These mappings highlight the severity of the issue and its relevance to both initial access and post-exploitation phases of an attack lifecycle.
Mitigation strategies must address both aspects of the vulnerability immediately. For unrestricted file uploads, it is essential to implement strict allow-listing for permitted file extensions rather than relying on deny lists which can be bypassed using obscure or legacy formats. Files should also be validated against their actual content signatures and stored in non-executable directories with restricted permissions. Regarding improper access control, the application must enforce robust identity verification and role-based access controls to ensure that only users with explicit permission can download specific files. Implementing secure session management and reviewing API endpoints for proper authorization checks are critical steps. Additionally, deploying a Web Application Firewall can provide an additional layer of defense by filtering out malicious upload requests before they reach the application logic until permanent patches or code fixes are applied.