CVE-2026-27674: Code Injection in SAP NetWeaver Java

The primary impact of CVE-2026-27674 is the potential for session compromise. A successful exploit allows an attacker to execute arbitrary client-side code within the victim's browser. This can lead to the theft of sensitive information, unauthorized access to application functionalities, and potential manipulation of data. The lack of authentication required for exploitation significantly broadens the attack surface, making it accessible to a wide range of attackers. The ability to execute arbitrary code opens the door to various malicious activities, including cross-site scripting (XSS) attacks and the injection of malware. While the description doesn't explicitly mention lateral movement, a compromised session could be leveraged to gain further access within the SAP environment.

1. Reserved2026-02-23
2. Published2026-04-14
3. Modified2026-04-15
4. EPSS updated2026-04-21

The primary mitigation for CVE-2026-27674 is to upgrade to a patched version of SAP NetWeaver Application Server Java (Web Dynpro Java) as soon as it becomes available. SAP has not yet released a fixed version, so monitoring SAP Security Notes is crucial. As a temporary workaround, implement strict input validation and sanitization on all user-supplied data within the Web Dynpro Java application. Consider using a Web Application Firewall (WAF) to filter out potentially malicious input. Regularly review and update application security configurations to minimize the attack surface. After applying any mitigation, thoroughly test the application to ensure functionality remains intact and the vulnerability is effectively addressed.