CVE-2026-76969 Overview
CVE-2026-76969 affects the @sap/cds-mtxs NPM library used by SAP Cloud Application Programming (CAP) multitenant applications with extensibility enabled. The library performs insufficient checks on specific functionality, allowing unauthenticated attackers to send crafted requests that retrieve sensitive credentials. Attackers can then abuse those credentials to replace or delete tenant data. The flaw maps to CWE-522: Insufficiently Protected Credentials and is reachable over the network without authentication or user interaction.
Critical Impact
Unauthenticated network attackers can obtain tenant credentials and destroy or replace tenant data, producing high impact on integrity and availability with partial confidentiality exposure.
Affected Products
- SAP @sap/cds-mtxs NPM library
- SAP Cloud Application Programming (CAP) multitenant applications with extensibility enabled
- Tenant data stores managed through CAP multitenancy services
Discovery Timeline
- 2026-09-08 - CVE-2026-76969 published to the National Vulnerability Database
- 2026-09-08 - Last updated in NVD database
Technical Details for CVE-2026-76969
Vulnerability Analysis
The @sap/cds-mtxs library provides multitenancy and extensibility services for SAP CAP applications. Multitenant CAP deployments use the library to provision tenants, deploy tenant-specific extensions, and manage backing service credentials. The vulnerability arises from missing authorization and validation checks on endpoints that expose credential material used by these workflows.
An unauthenticated attacker sends specially crafted requests to affected endpoints and receives sensitive credentials in the response. Those credentials grant privileged access to tenant-scoped backing services such as databases or persistence stores. With that access, the attacker can overwrite or delete tenant records, corrupting integrity and denying availability to legitimate tenants.
Because the impacted functionality is tied to extensibility, applications that enable tenant extension features are exposed. Confidentiality impact is partial because the credentials themselves are the primary disclosed asset; broader business-data disclosure depends on how the compromised credentials are subsequently used.
Root Cause
The root cause is insufficient access control on functionality that handles credentials within @sap/cds-mtxs. The library does not adequately verify caller identity or authorization before returning credential material, classifying it under CWE-522.
Attack Vector
Exploitation requires network access to a vulnerable multitenant CAP application with extensibility enabled. No authentication, privileges, or user interaction are required. The attacker issues crafted HTTP requests to the exposed multitenancy service, extracts credentials, and reuses them against tenant backing services.
No public proof-of-concept exploit is listed in the CVE record. Refer to SAP Note #3798315 and the SAP Security Patch Day portal for the vendor's technical description.
Detection Methods for CVE-2026-76969
Indicators of Compromise
- Unauthenticated HTTP requests to @sap/cds-mtxs multitenancy or extensibility endpoints originating from unexpected source addresses.
- Anomalous tenant credential retrieval events not tied to legitimate provisioning or deployment workflows.
- Bulk UPDATE, DELETE, or schema modifications against tenant databases performed with service credentials outside normal maintenance windows.
- Sudden loss of tenant data or tenant-reported integrity issues correlated with prior access to CAP multitenancy routes.
Detection Strategies
- Inspect reverse proxy and application logs for unauthenticated calls to /-/cds/* or other @sap/cds-mtxs routes.
- Alert on repeated requests to multitenancy endpoints from a single source that lacks a valid session or tenant context.
- Correlate credential fetch events with subsequent write activity in tenant backing services to identify credential reuse.
Monitoring Recommendations
- Forward CAP application logs, ingress logs, and database audit logs into a central analytics platform for correlation.
- Baseline normal tenant provisioning volume and rate to make anomalous credential requests stand out.
- Enable database-side audit logging on tenant persistence services to record connection identities and destructive statements.
How to Mitigate CVE-2026-76969
Immediate Actions Required
- Apply the fixed @sap/cds-mtxs version referenced in SAP Note #3798315 to every affected CAP application.
- Rotate all tenant backing-service credentials that could have been exposed through the vulnerable endpoints.
- Review tenant data for unauthorized modification or deletion and restore from verified backups where necessary.
- Restrict network exposure of multitenancy management endpoints to trusted networks pending patch deployment.
Patch Information
SAP has published remediation guidance in SAP Note #3798315, released as part of SAP Security Patch Day. Upgrade @sap/cds-mtxs to the fixed version specified in the note and redeploy affected CAP applications. Verify the installed version with npm ls @sap/cds-mtxs after deployment.
Workarounds
- Disable extensibility features in multitenant CAP applications where the functionality is not required.
- Place the CAP application behind an authenticating reverse proxy that blocks anonymous access to multitenancy routes.
- Apply network-layer allowlists so only trusted orchestration services can reach @sap/cds-mtxs endpoints.
# Verify installed @sap/cds-mtxs version and update to the fixed release
npm ls @sap/cds-mtxs
npm install @sap/cds-mtxs@latest --save
npm audit --production
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
