External risk intelligence

SAP CAP MTXSS Credential Exposure and Tenant Data Tampering Vulnerability

CVE advisorySeverity: CRITICAL (CVSS 9.4)

CVE-2026-76969

The vulnerability affects a multitenant application framework library designed for extensibility. Such applications are commonly deployed as web-based services or APIs reachable over the internet to support tenant access, making the vulnerable functionality frequently exposed to network-based requests.

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

A vulnerability in a SAP component could allow unauthenticated attackers to access sensitive credentials and potentially disrupt or delete tenant data, impacting the availability and integrity of applications, with possible partial impact on data confidentiality.

Component flaw allows credential theft.
Affects multitenant SAP applications.
Confirms relevance and exposure.

Attack Path

How an attacker could exploit the issue

An unauthenticated attacker could exploit a vulnerability in a multitenant application framework to gain unauthorized access to sensitive credentials. This could allow them to modify or delete tenant data, leading to significant disruption.

No authentication required.
Specially crafted requests trigger vulnerability.
Unauthorized data modification or deletion.

Live Threat

Current exploitation, exposure, and threat context

This vulnerability in the `@sap/cds-mtxs` library could allow an unauthenticated attacker to access sensitive credentials. When extensibility is enabled in multitenant CAP applications, specially crafted requests may be used to replace or delete tenant data, potentially impacting the confidentiality, integrity, and availability of business data.

Tenant data and application integrity.
Specially crafted network requests.
Data deletion, modification, or unauthorized access.

Operational Fix

Recommended remediation, mitigation, and detection steps

Technical leaders should identify application owners, platform teams, and potentially vendor-management teams to address this vulnerability. The first practical step is to locate all instances of the affected technology, confirm their accessibility and business criticality, and then assign ownership for remediation planning based on the identified risk.

Application owners must lead remediation efforts.
Verify if multitenant CAP applications are exposed.
Plan and coordinate necessary maintenance.

Supplementary metadata

CVSS vector

Validate whether this threat affects your internet-facing exposure.

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Frequently asked questions

What is the @sap/cds-mtxs library?

This NPM library is a core component of the SAP Cloud Application Programming model (CAP). It specifically provides the framework for building multitenant applications, allowing developers to host multiple separate business tenants on a single shared instance while supporting custom extensions for each tenant.

What does CWE-522 mean for CVE-2026-76969?

CWE-522 refers to insufficiently protected credentials. In the context of this vulnerability, it means the software fails to properly secure sensitive access tokens or authentication data, allowing an unauthorized person to retrieve them and impersonate legitimate users or system processes.

How do attackers trigger this vulnerability?

An attacker triggers this by sending specially crafted network requests to the application. The bug specifically resides in how the library handles certain functions when tenant extensibility is enabled. It is not triggered by standard, legitimate application traffic that follows expected operational patterns.

Is my application at risk according to Halo Surface Signal?

Halo Surface Signal notes that because this library is used to build web-based multitenant services intended for tenant access, these applications are often reachable over the internet. If your CAP application is configured for extensibility and is internet-facing, it is more likely to be accessible to these network-based requests.

What should I do first to manage this risk?

Begin by identifying all applications in your environment that utilize the @sap/cds-mtxs library. Coordinate with your application owners to determine which of these services have tenant extensibility enabled and verify their network accessibility to prioritize which systems need immediate attention.

References

me.sap.com/notes/3798315

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.