CVE-2026-56599 in BigFix Service Management
Summary
by MITRE • 10/01/2026
HCL BigFix Service Management is affected by an Insecure Cookie Attribute Configuration vulnerability, which could allow an attacker to exploit missing security attributes such as SameSite, HttpOnly, Secure, and restrictive Paths, enabling Cross-Site Request Forgery (CSRF), session hijacking via Cross-Site Scripting (XSS), and unauthorized access.
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Analysis
by VulDB Data Team • 10/01/2026
The identified vulnerability in HCL BigFix Service Management stems from an insecure configuration of HTTP cookies used for session management and authentication persistence. This flaw is categorized under CWE-614, which describes the Sensitive Cookie in Session Without Secure Attribute, although it broadly encompasses a wider range of missing security controls including CWE-1004 (Sensitive Cookie Without HttpOnly Flag) and CWE-356 (Insecure Deserialization if applicable to cookie content). The core technical issue lies in the absence or improper configuration of critical attributes on session cookies. Specifically, the Secure flag is not enforced, allowing cookies to be transmitted over unencrypted HTTP connections where they can be intercepted by network eavesdroppers. Furthermore, the HttpOnly attribute is missing, which permits client-side scripts, such as those injected via Cross-Site Scripting (XSS) vulnerabilities, to access and exfiltrate session tokens. The SameSite attribute is either absent or set to a permissive value that does not adequately restrict cross-site requests, thereby failing to mitigate CSRF attacks. Additionally, the Path attribute may be overly broad, increasing the attack surface by making cookies accessible to unrelated application endpoints.
The operational impact of these misconfigurations is severe and multifaceted. Without the Secure flag, an attacker performing a man-in-the-middle attack on unencrypted network traffic can capture active session tokens, leading directly to account takeover through session hijacking. The lack of HttpOnly protection means that if any XSS vector exists within the BigFix Service Management interface or associated components, malicious scripts can read cookie data and send it to remote servers controlled by the attacker. This effectively bypasses traditional browser security models designed to isolate application logic from user input. Moreover, the absence of strict SameSite attributes allows attackers to craft forged requests that leverage the victim's authenticated session state. Since browsers will automatically include cookies with matching domain and path criteria in cross-origin requests, an attacker can trick a logged-in administrator into performing unintended actions, such as changing system configurations or disabling security controls, without their knowledge or consent. This combination of flaws significantly lowers the barrier for exploitation, enabling unauthorized access to sensitive IT service management data and infrastructure control mechanisms.
From a threat intelligence perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Credential Access and Session Hijacking. Specifically, it facilitates T1539 (Steal Web Session Cookie) when combined with network interception or XSS, and supports T1089 (Disabling Security Tools) if CSRF is used to alter security settings. The vulnerability also relates to T1622 (Debugger Evasion), as attackers often rely on browser developer tools or script execution enabled by missing HttpOnly flags to manipulate session data during an attack chain.
To mitigate these risks, immediate remediation actions must focus on hardening the cookie configuration within the HCL BigFix Service Management application server settings. The Secure attribute should be set for all cookies containing sensitive information, ensuring they are only transmitted over HTTPS connections. This requires that the entire application infrastructure supports TLS and that clients enforce secure connection policies. The HttpOnly flag must be enabled to prevent JavaScript access to session tokens, thereby neutralizing XSS-based cookie theft vectors. Implementing a SameSite attribute with a value of Strict or Lax is critical to preventing CSRF attacks; Strict mode ensures cookies are not sent in cross-site requests at all, while Lax allows them only for top-level navigation GET requests. Additionally, the Path attribute should be restricted to the minimum necessary directory structure within the application to limit cookie scope and reduce exposure to unrelated endpoints. Regular security audits and automated scanning using tools that validate HTTP header configurations against industry standards like OWASP Secure Headers Project recommendations are essential to maintain this posture. Organizations should also ensure their web servers or reverse proxies correctly propagate these attributes if they handle session management, as misconfiguration at the infrastructure layer can override application-level settings.