Description

IBM WebSphere Application Server 9.0, and 8.5 is affected by a reflected cross-site scripting vulnerability.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "5.4",
  "pubDate": "2026-09-14T20:16:39.623Z",
  "pubdate": "2026-09-14T20:16:39.623Z",
  "executiveSummary": "IBM WebSphere Application Server versions 9.0 and 8.5 are susceptible to a reflected cross-site scripting (XSS) vulnerability.\nThis vulnerability exists due to improper validation of user-supplied input before rendering it in the application's response to the user's browser.\nAn unauthenticated, remote attacker can exploit this flaw by crafting a malicious URI containing a script payload, which, when clicked by an unsuspecting user, executes in the context of the user's browser session.\nThe successful exploitation of this vulnerability can lead to session hijacking, theft of sensitive authentication tokens, unauthorized actions performed on behalf of the victim, and redirection to malicious websites.\nThe risk is categorized as high, as it impacts the integrity and confidentiality of user interactions with the affected application server.\nMitigation requires implementing proper input sanitization, output encoding, and leveraging security headers to prevent unauthorized script execution.",
  "technicalDetails": "The vulnerability is a classic reflected cross-site scripting (XSS) flaw occurring within IBM WebSphere Application Server versions 9.0 and 8.5.\nThe root cause of this vulnerability lies in the application's failure to properly sanitize, validate, or contextually encode user-supplied input data before reflecting it back to the client's browser within the HTTP response.\nIn a typical attack flow, an attacker identifies a parameter or URL path component that is directly rendered back into the HTML response without adequate sanitization. The attacker crafts a specialized malicious URL containing a JavaScript payload within that parameter.\nThis payload is typically delivered to a victim via social engineering, such as a phishing link or an embedded link on a malicious website. When the authenticated victim clicks the link, the browser sends a request to the vulnerable IBM WebSphere application.\nThe server processes the request and embeds the malicious script into the HTML output. Upon receiving this response, the victim's browser executes the injected JavaScript, treating it as legitimate code originating from the trusted WebSphere server.\nThe execution occurs within the security context of the victim's session, allowing the attacker to access sensitive information such as session cookies, local storage, or CSRF tokens associated with the application domain.\nFurthermore, the attacker can leverage the browser context to perform unauthorized actions on behalf of the user, such as modifying account settings, exfiltrating sensitive data displayed on the page, or executing administrative tasks if the victim has elevated privileges.\nThe vulnerability does not require prior authentication or elevated privileges from the attacker; the requirement is solely for the victim to be authenticated to the vulnerable application and interact with the malicious link.\nThis exposure is primarily network-based, as the malicious request must be successfully processed and reflected by the WebSphere server to the victim's browser."
}