SAP Releases Critical Security Patches for NetWeaver and More

SAP has rolled out crucial security updates in its November 2026 patch release, targeting significant vulnerabilities in SAP NetWeaver, Web Dispatcher, Gateway, and other key business applications. Released on November 10, this update includes 35 new security notes, four GitHub security advisories, and updates to three previous notes.

Key Vulnerabilities Addressed

The patch release addresses four vulnerabilities with the highest possible CVSS score of 10.0, highlighting the urgency for security teams to prioritize these issues. The fixes tackle memory corruption, missing authentication, broken access control, and code injection flaws. SAP strongly advises all customers to consult its security support portal and implement the necessary corrections without delay. Administrators need to review each note for specific components affected, patch requirements, and deployment instructions.

One of the most severe vulnerabilities, identified as CVE-2026-76964, pertains to a memory corruption issue within SAP NetWeaver AS ABAP’s Internet Communication Manager. This flaw could be exploited by attackers to execute arbitrary code, thereby compromising the affected system entirely.

Critical Flaws in Web Dispatcher and Gateway

Another critical vulnerability (CVE-2026-89126) affects SAP Web Dispatcher, with a similar memory corruption issue impacting various kernel and runtime components. Note 3778556 provides details on addressing this vulnerability. Additionally, CVE-2026-89103 points to a flaw in SAP Gateway involving broken access control, detailed in Note 3798345.

The fourth critical issue, CVE-2026-120017, involves missing authentication within the SAML2 Service Provider of SAP NetWeaver AS ABAP. Notably, these vulnerabilities can be exploited without credentials or user interaction, underscoring the importance of immediate patch application.

Additional High-Severity Issues

Further critical vulnerabilities, with CVSS scores of 9.9, include CVE-2026-109803 in NetWeaver Knowledge Management XML Forms and CVE-2026-76965 in the ABAP Application Server. These require low-level privileges, differentiating them from the unauthenticated critical issues. Security teams are advised to prioritize these as well.

Developers should also pay attention to several GitHub advisories, which cover issues like improper JWT signature verification in SAP Cloud SDK for Python and path traversal vulnerabilities. Moreover, SAP has patched a cross-site request forgery vulnerability in Web Dispatcher and Internet Communication Manager, rated at 9.6.

Importance of Timely Updates

This release follows critical October updates addressing code injection and access control issues, highlighting the ongoing need for vigilance in applying SAP’s monthly patches. Security teams are encouraged to verify installed component versions against November’s notes, prioritize systems susceptible to critical flaws, and thoroughly test patches before production deployment. While no active exploitation has been reported, these vulnerabilities represent significant technical risks.