CVE-2026-101117 in WebSphere Extreme Scale
Summary
by MITRE • 11/08/2026
IBM WebSphere Extreme Scale 8.6.1.0 through 8.6.2.2 could allow a remote attacker to bypass security restrictions due to improper Content Security Policy configuration.
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Analysis
by VulDB Data Team • 11/08/2026
The vulnerability identified in IBM WebSphere Extreme Scale versions 8.6.1.0 through 8.6.2.2 represents a critical misconfiguration of the Content Security Policy mechanism, which serves as a primary defense against cross-site scripting and other code injection attacks within web-based applications. This flaw stems from an improper implementation or configuration of security headers that fail to adequately restrict the sources from which content can be loaded by the browser. In modern web application architecture, the Content Security Policy acts as a set of rules enforced by the user agent to determine whether specific resources such as scripts, stylesheets, images, and other media should be allowed to execute or load. When this policy is not configured with strict enough constraints, it creates an opening for malicious actors to manipulate how content is interpreted and rendered within the client environment.
From a technical perspective, the core issue lies in the permissive nature of the security restrictions applied by the application server during its interaction with web clients. An attacker capable of interacting with the vulnerable instance can exploit this looseness to inject unauthorized scripts or redirect user interactions to malicious endpoints. This bypass is not necessarily due to a code execution flaw within the Java backend itself, but rather a failure in the front-end security controls that govern how the browser processes responses from the server. The absence of restrictive directives such as script-src with strict origins allows for the injection of arbitrary JavaScript payloads, which can then be executed in the context of the trusted domain associated with IBM WebSphere Extreme Scale.
The operational impact of this vulnerability is significant, particularly in enterprise environments where sensitive data processing and management occur through web interfaces. Successful exploitation could lead to unauthorized access to confidential information stored within the application session or local storage. Attackers may leverage this weakness to perform cross-site scripting attacks that steal authentication cookies, hijack user sessions, or deface the application interface. In more severe scenarios, if the injected scripts have sufficient privileges or interact with other vulnerable components, it could facilitate further lateral movement within the network infrastructure. The ability to bypass security restrictions undermines the integrity of the web application and compromises the trust relationship between the client browser and the server.
This vulnerability aligns closely with CWE-79, which categorizes improper neutralization of input during web page generation as a common weakness leading to cross-site scripting issues. Furthermore, from an offensive cybersecurity framework perspective, it relates to techniques found in MITRE ATT&CK under the category of Client-side Injection, specifically those involving script injection or DOM manipulation. The exploitation vector typically involves remote interaction with the web interface, making it accessible over standard network protocols without requiring prior authentication if the affected pages are publicly reachable, though authenticated attacks remain a high-risk scenario for internal applications.
Mitigation strategies must focus on hardening the Content Security Policy configuration to enforce strict origin controls and disable inline script execution where possible. Administrators should review all CSP headers implemented by IBM WebSphere Extreme Scale instances within this version range and ensure that directives such as default-src, script-src, and object-src are set to restrictive values like self or specific trusted domains rather than wildcards. Additionally, implementing a Content Security Policy report-only mode can help identify potential violations without blocking legitimate traffic during the transition period. Regular security audits and penetration testing should be conducted to verify that these policies are correctly enforced by modern browsers and do not contain loopholes that allow for bypass techniques. Keeping the software updated to versions beyond 8.6.2.2 where such configurations may have been corrected is also a critical step in reducing the attack surface associated with this specific misconfiguration.