CVE-2026-108588 in Db2 Genius Hub
Summary
by MITRE • 11/04/2026
IBM Db2 Genius Hub 1.1.2, 1.1.3, 1.1.4, 1.1.5 could allow a remote authenticated attacker to bypass security restrictions due to a missing X-Content-Type-Options header allowing MIME type sniffing.
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Analysis
by VulDB Data Team • 11/04/2026
The vulnerability identified in IBM Db2 Genius Hub versions 1.1.2 through 1.1.5 stems from the absence of the X-Content-Type-Options HTTP response header, which creates a significant security gap related to how browsers interpret content served by the application. This missing configuration allows for MIME type sniffing, a behavior where web browsers attempt to determine the actual file format and programming language of a resource based on its contents rather than relying solely on the Content-Type header provided by the server. When this protection is absent, an attacker can exploit discrepancies between declared content types and actual payloads to execute malicious scripts or inject harmful code that bypasses standard security controls like Cross-Site Scripting filters.
From a technical perspective, modern web browsers employ heuristic analysis to guess the correct MIME type if it is ambiguous or missing. For instance, if a server incorrectly labels an HTML file as plain text but includes executable JavaScript within its body, a browser without strict MIME checking may still execute that script because it recognizes the code patterns typical of JavaScript. This behavior undermines the integrity of Content Security Policies and other defensive mechanisms designed to restrict execution contexts. By omitting the X-Content-Type-Options header with a value of nosniff, IBM Db2 Genius Hub inadvertently permits this heuristic processing, thereby expanding the attack surface for remote authenticated attackers who have already gained access to the system but seek to escalate their impact through client-side exploitation techniques.
The operational impact of this vulnerability is primarily centered on potential cross-site scripting attacks and data injection scenarios. Although the attacker must be authenticated, which limits the pool of potential adversaries compared to unauthenticated exploits, the ability to bypass MIME type restrictions can lead to severe consequences within the context of a trusted session. An attacker could craft requests that trick the browser into interpreting malicious payloads as executable content, potentially leading to session hijacking, credential theft, or unauthorized manipulation of data displayed in the user interface. This undermines the confidentiality and integrity guarantees expected from an enterprise database management tool like Db2 Genius Hub, especially when used in environments where sensitive operational data is managed through web-based interfaces.
To mitigate this risk, it is imperative that administrators ensure all HTTP responses generated by IBM Db2 Genius Hub include the X-Content-Type-Options: nosniff header. This directive instructs browsers to strictly adhere to the declared Content-Type and prevents them from performing MIME type sniffing. If direct configuration of application headers is not feasible through standard administrative interfaces, this security control should be enforced at the reverse proxy or web server level using appropriate module configurations such as Apache mod_headers or Nginx add_header directives. Regular vulnerability scanning and compliance checks against industry standards like CWE-16 for Improper Neutralization of BOM for XML Documents and related MIME sniffing weaknesses are recommended to ensure that this configuration remains intact during updates or infrastructure changes, thereby maintaining a robust defense-in-depth posture aligned with ATT&CK techniques involving browser-based code injection.