External risk intelligence

SAP NetWeaver Remote Code Execution via Insufficient Authorization and Input Validation

CVE advisorySeverity: CRITICAL (CVSS 9.9)

CVE-2026-109795

SAP NetWeaver is a foundational enterprise application platform commonly deployed as an internet-facing gateway, application server, or integration hub. While internal configurations exist, its role in providing remote-enabled functionality and services often places it within reach of external network segments, making it a common target for internet-based interactions.

Code Injection

Halo Surface Signal: 4 out of 5 — likely to be public-facing.

External exposure likelihood

Horizon Alert

Summary of the vulnerability and why it matters

This advisory concerns a critical vulnerability in SAP NetWeaver, a widely used enterprise application platform. The issue involves insufficient authorization and input validation, which could allow an attacker with limited access to execute arbitrary code. Successful exploitation could significantly impact the confidentiality, integrity, and availability of affected systems, potentially extending the attacker's control.

SAP software has a weakness allowing code execution.
It could impact system security and data integrity.
Confirm SAP NetWeaver exposure and potential risk.

Attack Path

How an attacker could exploit the issue

An attacker, potentially with limited initial privileges, could interact with a remote interface on SAP NetWeaver. By sending specially crafted data, they could bypass security checks and input validation to execute arbitrary code, potentially impacting the confidentiality, integrity, and availability of the system.

Entry condition: Low privileges.
Trigger point: Remote-enabled functionality with improper checks.
Resulting risk: Arbitrary code execution and system compromise.

Live Threat

Current exploitation, exposure, and threat context

When supported by the advisory, an attacker with low privileges could exploit insufficient authorization checks and input validation within SAP NetWeaver's remote-enabled functions. This could allow them to inject and execute arbitrary code, potentially impacting the confidentiality, integrity, and availability of the affected system beyond the initially vulnerable component.

SAP NetWeaver system data.
Attacker sends crafted remote interface input.
High impact on confidentiality, integrity, availability.

Operational Fix

Recommended remediation, mitigation, and detection steps

SAP NetWeaver's remote-enabled functionality is likely managed by application owners, infrastructure teams, and potentially vendor-management teams. The first step is to identify all instances of the affected technology, confirm their accessibility and criticality, and locate the accountable owner to plan remediation based on the risk profile.

Identify affected SAP NetWeaver instances.
Verify business criticality and exposure.
Plan remediation with application owners.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is SAP NetWeaver and how is it used?

SAP NetWeaver is a foundational technology platform that serves as the infrastructure for running SAP enterprise applications. It functions as an application server and integration hub, enabling businesses to manage data, communicate between different software systems, and provide web-based access to remote services across an organization.

How does CVE-2026-109795 allow unauthorized code execution?

This vulnerability involves a weakness known as Improper Control of Generation of Code (CWE-94). The system fails to properly validate incoming data and check user permissions within its remote-enabled functions. Because these security checks are missing, an attacker can supply malicious input that the system mistakenly interprets as legitimate commands, leading to arbitrary code execution.

Does any input trigger this vulnerability?

No. The vulnerability is specifically triggered by specially crafted input sent through the system's remote-enabled interfaces. Simple or routine interactions with the software do not trigger the bug; the attacker must provide specific, malicious data designed to bypass the existing, albeit insufficient, validation processes.

Why is this CVE concerning for internet-facing systems?

Halo Surface Signal indicates that SAP NetWeaver is frequently deployed as an internet-facing gateway or integration hub. Because it is designed to handle remote requests, it is often reachable from external network segments. This placement increases the likelihood that an attacker could reach the vulnerable interface over the internet, rather than being restricted to internal-only network access.

What should I do first to manage this risk?

The immediate priority is to identify all running instances of SAP NetWeaver within your environment. Once identified, evaluate the business criticality and network exposure of these instances. Work with the designated application or infrastructure owners to review the available vendor security notes and coordinate a patching plan that aligns with your organization's risk profile.

References

me.sap.com/notes/3834842

Written by Nicholas Merritt

Nicholas Merritt is VP of Security Solutions at Halo Security. With more than 25 years across application security, vulnerability prioritization, and offensive security, he helps teams translate threat data into practical exposure validation and remediation focus. He authors Halo Threat Intelligence CVE advisories using Halo Surface Signal and H/A/L/O context to prioritize internet-facing risk.