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CVE-2026-76969 – Unauthenticated Credential Disclosure – SAP Cloud Application Programming Model (@s

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Summary

CVE-2026-76969 is a critical credential disclosure vulnerability affecting the @sap/cds-mtxs NPM library, a core multitenancy extension component of the SAP Cloud Application Programming Model (CAP). The flaw stems from insufficient validation checks in multitenant CAP applications that use extensibility features, allowing an unauthenticated attacker to send specially crafted requests and extract sensitive credentials. With a CVSS v3.1 base score of 9.4, this issue can lead to unauthorized modification or removal of tenant data.

Technical details

  • Root cause: The @sap/cds-mtxs library performs insufficient validation of requests in multitenant CAP applications that have extensibility features enabled.
  • Trigger conditions: The vulnerable code path is reachable in multitenant SAP CAP deployments where tenant extensibility is active; no special configuration beyond enabling extensibility is required.
  • Attack vector: Remote, network-based exploitation — the attacker sends specially crafted requests to the exposed multitenant service without needing prior authentication or user interaction.
  • Impact: Disclosure of sensitive credentials (confidentiality impact rated Low), which can subsequently be leveraged to modify or delete tenant data (integrity and availability impacts both rated High).

Affected software

  • SAP Cloud Application Programming Model — @sap/cds-mtxs NPM package:
    • Versions up to and including 1.18.3
    • Versions up to and including 2.7.6
    • Versions up to and including 3.9.6
    • Versions up to and including 4.0.2

Severity

  • CVSS v3.1 Base Score: 9.4 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H

Mitigation and recommended actions

  • Immediate: Update the @sap/cds-mtxs NPM package to the patched release referenced in SAP Security Note 3798315, released as part of SAP’s Security Patch Day. Organizations using multitenant CAP applications with extensibility features should prioritize this update given the unauthenticated, network-exploitable nature of the flaw.
  • If immediate patching is not possible: Restrict network exposure of multitenant CAP application endpoints (e.g., via API gateway or network-layer access controls) until the patched library version can be deployed, and review tenant extensibility configurations to disable the feature where it is not actively required.
  • Monitor SAP CAP application logs for anomalous or malformed requests targeting multitenancy/extensibility endpoints as a compensating detective control.

References

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