CVE-2026-67077 in BigFix
Summary
by MITRE • 10/28/2026
HCL BigFix AEX is affected by a Server-Side Request Forgery vulnerability, which could allow an attacker to cause the application to send unauthorized requests to external resources. Successful exploitation could lead to access to unintended services, sensitive information disclosure, or unauthorized actions through the affected application.
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Analysis
by VulDB Data Team • 10/28/2026
The identified vulnerability in HCL BigFix AEX represents a critical Server-Side Request Forgery flaw that fundamentally compromises the integrity of server-side request handling mechanisms. This security weakness arises from insufficient validation and sanitization of user-supplied input within the application's network communication modules, allowing an attacker to manipulate the destination addresses or parameters associated with outbound requests initiated by the backend system. By exploiting this misconfiguration, a malicious actor can trick the BigFix AEX server into making HTTP or other protocol-based connections to arbitrary external hosts that are not part of the intended operational scope. This capability effectively bypasses standard network perimeter defenses and access control lists because the traffic originates from a trusted internal IP address, thereby evading many traditional intrusion detection systems that rely on source reputation rather than content analysis.
The technical execution of this vulnerability typically involves crafting specific API calls or web requests where parameters controlling URL destinations are not strictly validated against an allowlist of permitted domains or services. An attacker can inject malicious payloads into these fields to redirect the server's outbound traffic toward internal network resources, cloud metadata endpoints, or external command-and-control servers. This behavior aligns with CWE-918, which classifies Server-Side Request Forgery as a failure in validating user-supplied input before using it to construct web requests. The absence of robust domain whitelisting and the lack of strict output encoding for URL components create an environment where the application acts as an unwitting proxy for malicious actors, facilitating further attacks that would otherwise be impossible from external networks due to firewall restrictions or network segmentation policies.
The operational impact of this vulnerability is severe, potentially leading to significant data breaches and unauthorized system modifications. Successful exploitation enables attackers to access sensitive internal services such as database servers, administrative consoles, or configuration management endpoints that are not exposed directly to the internet but are reachable from the BigFix AEX server's network segment. This can result in the exfiltration of confidential client data, inventory information, or patch status details stored within the BigFix infrastructure. Furthermore, attackers may leverage this access to perform unauthorized actions against internal assets, such as modifying system configurations, deploying malicious payloads via integrated management tools, or pivoting deeper into the enterprise network. The ability to interact with cloud metadata services like AWS EC2 instance metadata could also lead to the compromise of temporary credentials and subsequent full control over associated cloud resources, amplifying the risk beyond the immediate application layer.
To mitigate this vulnerability, organizations must implement strict input validation strategies that enforce a whitelist approach for all outbound URL destinations within the BigFix AEX environment. This involves configuring the application to only permit connections to explicitly defined and trusted domains or IP addresses, rejecting any requests targeting unknown or suspicious endpoints. Additionally, network-level controls should be deployed to restrict egress traffic from the BigFix servers using firewalls that enforce granular rules based on destination ports and protocols, ensuring that even if an attacker manipulates application inputs, they cannot reach unauthorized external services. Regular security audits of API implementations and continuous monitoring for anomalous outbound connection patterns are essential components of a defense-in-depth strategy to detect and prevent exploitation attempts in real-time.