CVE-2026-0499 is a reflected cross-site scripting (XSS) vulnerability classified under CWE-79, affecting SAP NetWeaver Enterprise Portal version EP-RUNTIME 7.50. The vulnerability arises due to improper neutralization of input during web page generation, specifically in URL parameters that are not adequately sanitized or encoded before being reflected in the server's HTTP response. An unauthenticated attacker can craft a malicious URL containing JavaScript code embedded in a parameter. When a user visits this URL, the malicious script executes in the context of the user's browser session with the portal, potentially allowing the attacker to steal session cookies, manipulate portal content, or redirect users to malicious sites. The vulnerability impacts the confidentiality and integrity of the application data but does not affect availability. The CVSS v3.1 score is 6.1 (medium severity), reflecting network attack vector, low attack complexity, no privileges required, but requiring user interaction and having a scope change. No patches or exploits are currently publicly available, but the vulnerability is published and should be addressed proactively. The vulnerability is particularly critical in environments where sensitive business processes and data are accessed through the SAP NetWeaver Enterprise Portal, as session hijacking or content manipulation could lead to further compromise or data leakage.

For European organizations, this vulnerability poses a risk to the confidentiality and integrity of sensitive business information accessed via SAP NetWeaver Enterprise Portal. Attackers exploiting this flaw could hijack user sessions, leading to unauthorized access to corporate resources, data theft, or manipulation of portal content, potentially causing misinformation or fraud. Although availability is not impacted, the breach of confidentiality and integrity could have regulatory consequences under GDPR, especially if personal or sensitive data is exposed. Organizations in finance, manufacturing, and public sectors that rely heavily on SAP portals for critical operations are at higher risk. The need for user interaction (clicking a malicious link) means phishing campaigns could be a common exploitation vector, increasing the threat surface. Given SAP's widespread use in Europe, the vulnerability could affect a broad range of enterprises, potentially disrupting trust and operational security.

1. Apply official SAP patches or updates as soon as they become available for EP-RUNTIME 7.50. 2. Implement web application firewall (WAF) rules to detect and block malicious input patterns targeting URL parameters in the portal. 3. Enforce strict Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context. 4. Educate users to recognize and avoid clicking suspicious links, especially those received via email or external sources. 5. Conduct regular security assessments and penetration testing focused on input validation and XSS vulnerabilities within the portal environment. 6. Utilize SAP's security notes and guidelines to harden the portal configuration, including disabling unnecessary URL parameters or features that reflect user input. 7. Monitor logs for unusual access patterns or repeated attempts to exploit URL parameters. 8. Consider implementing multi-factor authentication (MFA) to reduce the impact of session hijacking.