CVE-2026-76969

Executive Summary

CVE-2026-76969 is a critical (CVSS 9.4) vulnerability in the @sap/cds-mtxs NPM library, a component of SAP Cloud Application Programming (CAP) used for multitenancy and extensibility in CAP-based applications. An unauthenticated attacker can send specially crafted requests to the affected functionality, leading to disclosure of sensitive credentials (CWE-522) that can subsequently be abused to replace or delete tenant data, with a high impact on integrity and availability and partial impact on confidentiality.

Organizations running multitenant CAP applications with extensibility enabled and the @sap/cds-mtxs package in their dependency tree are at risk. No patch is currently available, no public PoC exists, and the vulnerability is not listed on CISA's Known Exploited Vulnerabilities catalog. Immediate mitigation should focus on restricting network access to the affected components and auditing tenant data integrity.

Technical Analysis

The @sap/cds-mtxs NPM library is SAP's official extensibility and multitenancy support package for the CAP (Cloud Application Programming) framework. It manages tenant isolation, extension deployment, and versioning of model extensions across multiple tenants within a single CAP application instance.

Per the NVD description, the library "does not perform sufficient checks on certain functionality used in multitenant CAP applications with extensibility enabled." The precise code-level details — including the affected function names, endpoint paths, and request structures — are not disclosed in the available CVE description or CNA title. It is therefore not possible at this time to name the exact vulnerable code sections without risking fabrication.

What can be derived from the description and CWE classification (CWE-522: Insufficiently Protected Credentials):

1. Vulnerability class: The advisory references inadequate verification of requests reaching credential-handling functionality. The combination of CWE-522 with a network-exploitable, unauthenticated attack vector suggests the library exposes an endpoint or internal routine that is intended to be protected (e.g., requiring administrative context or tenant-scoped session) but which fails to enforce the expected checks, allowing the retrieval of credential material.

2. Data exposure: The CWE-522 classification indicates credentials are stored in a form that is, under the flawed logic, retrievable without proper authorization. In the CAP/multitenancy context, this likely involves tenant-specific database credentials, SAP HANA connection parameters, or extension-bundle signing keys used to authorize model extensions.

3. Attack surface: The vulnerable functionality is reachable via network requests — the description explicitly states "an unauthenticated attacker could send specially crafted requests." This indicates a public-facing HTTP surface, likely an embedded router or middleware inside the CAP application that handles extensibility management and tenant provisioning requests.

4. Impact downgrade nuance: The CVSS vector shows Confidentiality is rated Low (C:L) — indicating the credential exposure alone is not the end state — whereas Integrity and Availability are both rated High (I:H/A:H). This implies the borrowed credentials are leveraged for a second-stage action: replacing or deleting tenant data (i.e., destructive write access to tenant schemas or application-managed data stores).

5. Scope: The flaw specifically impacts deployment scenarios where CAP applications enable extensibility in a multitenant configuration. Single-tenant CAP applications that do not use the multitenancy features of @sap/cds-mtxs are unlikely to be exploitable through this path, as the vulnerable functionality is described as existing "in multitenant CAP applications with extensibility enabled."

6. No patch, no details: Patch confidence is 0/4, with no evidence of vendor advisory, fixed version, or workaround from any tracked source. No affected version range has been published, meaning the maintainers have not yet disclosed which releases contain the flaw — conservatively, assume all current public releases are affected until SAP or the package maintainer publishes an advisory.

Exploitation Scenarios

No public PoC or exploit code is available; the following attack chain is inferred from the vulnerability class and NVD description and should be treated as an analytic projection, not a confirmed exploit path.

Step 1 — Reconnaissance / target identification: An attacker scans for publicly reachable CAP applications. Fingerprinting indicators include HTTP headers or response patterns common to SAP CAP runtime (e.g., sap-target-active, x-cds-* headers, or the SAP Cloud Application Programming model payload shapes in API responses). Applications exposing the @sap/cds-mtxs extension endpoints are typically identified by paths such as the standard CAP extension service endpoints (the exact path names are not disclosed in the CVE description). Subdomain enumeration for typical SAP BTP (Business Technology Platform) application URLs may also reveal candidate targets.

Step 2 — Triggering the specific flaw class: The attacker crafts HTTP requests targeting the "functionality used in multitenant CAP applications with extensibility enabled." Based on the CVE description language, the flaw is an authorization/authentication check gap: the endpoint processes requests without verifying the caller's identity or tenant-scoping. The attacker sends specially crafted requests that impersonate a legitimate extension-management operation — for example, a request to read a tenant's extension configuration or credentials. Because the library lacks sufficient checks, the request is processed and returns credential material. The "specially crafted" qualifier implies the request must contain specific parameters or header structures that cause the library to bypass its normal validation logic.

Step 3 — Payload / execution method (vulnerability-class level): The exact request structure cannot be derived from the NVD data. At the class level (CWE-522), the flaw is an information-disclosure-by-design gap: the server-side routine that fetches stored credentials (disclosed as "sensitive credentials" in the description) is reachable without authentication, or with request parameters that circumvent the intended role check. The response contains credential material in some serialized form (likely base64-encoded JSON within the CAP extension descriptor, a common pattern in such libraries).

Step 4 — Post-exploitation impact: With acquired credentials, the attacker authenticates to the underlying data layer (e.g., tenant-specific database schema). The credentials likely carry privileges consistent with the CAP application's own tenant-management role — sufficient to execute replacement of tenant data (overwriting business records or application configuration with attacker-controlled content) and deletion of tenant data (destructive data-loss events). The high availability/integrity scores indicate an attacker can disrupt service and corrupt the canonical dataset of one or multiple tenants, which in a multitenant deployment could cascade to cross-tenant impact if credential reuse across tenants is present.

Additional note on second-stage spread: If the credential store is shared across tenants (i.e., the library retrieves credentials via a tenant header but fails to properly scope the retrieval), one set of exposed credentials could potentially be used to access other tenants' data, expanding the blast radius beyond a single tenant. This is an inference from the multitenancy context, not a definitive claim from the CVE data.

Impact Assessment

Business impact for the enterprise:

• Data-loss exposure: The high availability score signals actual destruction of data is possible, not just data corruption that could be repaired. This ranks as a severe business continuity risk for any multitenant SaaS built on SAP CAP.
• Regulatory exposure: If tenant data is deleted or replaced, the operator bears responsibility for breach-notification obligations (GDPR Art. 33/34) even if the deletion was not classical data theft, as it constitutes a confidentiality/availability incident.
• Multi-tenant cascade: In a shared multi-tenant infrastructure, a compromise of the credential-management layer of @sap/cds-mtxs may grant access across tenants, compounding the impact beyond the initially targeted tenant.
• Supply-chain component: Since @sap/cds-mtxs is an NPM dependency, the vulnerability exists wherever the package is deployed. Organizations running CAP applications on SAP BTP Cloud Foundry or Kubernetes are the primary affected population.

No evidence of in-the-wild exploitation. The vulnerability is not on CISA's KEV list, and no threat-actor campaign referencing this CVE has been identified.

Detection Guidance

The following detection artifacts are provided to help SOC teams identify potential exploitation attempts. Since no PoC is public and the exact exploit request structure is unknown, these rules focus on the observable fingerprints of the vulnerability class: anomalous requests to CAP extension-management endpoints, authentication anomalies, and credential-related activity following suspicious request patterns.

Sigma Rule

title: Suspicious SAP CAP cds-mtxs Extension Request
id: 6f8b3e9a-2c1d-4a5e-9f0b-1a2b3c4d5e6f
status: experimental
description: Detects anomalous requests targeting SAP CAP multitenancy/extensibility endpoints that may indicate attempts to exploit CVE-2026-76969 (unauthorized credential retrieval in @sap/cds-mtxs).
author: Valtersit Threat Intelligence
date: 2026/02/10
tags:
    - attack.initial_access
    - attack.t1190
    - cve.2026.76969
logsource:
    category: webserver
    product: apache
detection:
    selection_cap_endpoint:
        cs-uri-path|contains|all:
            - '/ext'
            - '/tenant'
    selection_no_auth:
        cs-username|contains: '-'
    filter_known_tenants:
        cs-uri-query|contains: 'tenant='
    condition: selection_cap_endpoint and selection_no_auth and not filter_known_tenants
    timeframe: 5m
level: high
falsepositives:
    - Legitimate internal monitoring scripts
    - Automated health checks from SAP BTP
fields:
    - c-ip
    - cs-method
    - cs-uri-stem

YARA Rule

rule cve_2026_76969_sap_cds_mtxs_credential_exposure
{
    meta:
        author = "Valtersit Threat Intelligence"
        description = "Detects payloads/scripts that replicate CVE-2026-76969 exploitation attempts against SAP CAP @sap/cds-mtxs. Matches on credential-request strings and CAP tenant extension patterns."
        date = "2026-02-10"
        severity = "critical"
        reference = "CVE-2026-76969"
        cve = "CVE-2026-76969"
    strings:
        $a = "cds-mtxs" ascii nocase
        $b = "tenant" ascii nocase
        $c = "credentials" ascii nocase
        $d = "@sap/cds" ascii nocase
        $e = "extension" ascii nocase
        $f = "getCredentials" ascii nocase
        $g = "/mtx/extension" ascii nocase
    condition:
        uint16(0) == 0x0A0D or
        uint16(0) == 0x0D0A or
        any of ($a*) and any of ($b*) and any of ($c*)
        and (#a > 0 and #b > 0) and filesize < 5MB
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (
    msg:"ET EXPLOIT CVE-2026-76969 SAP CAP cds-mtxs Credential Disclosure Attempt";
    flow:established,to_server;
    content:"POST"; http_method;
    content:"/ext"; http_uri;
    content:"tenant"; http_uri;
    content:"credentials"; http_client_body; nocase;
    classtype:attempted-user;
    sid:2026769691;
    rev:1;
    metadata:created_at 2026_02_10, cve CVE-2026-76969;
    reference:url,nvd.nist.gov/vuln/detail/CVE-2026-76969;
)

Elastic Detection

sequence by host.ip, source.ip with maxspan=30s
  [network where dns_query != null and dns_query == "*sap*" and process.executable != null
     and network.protocol != null]
  [process where event.action in ("http_request", "web_request") and
     process.args != null and (
       wildcard(process.args, "*cds-mtxs*") or
       wildcard(process.args, "*tenant*") or
       wildcard(process.args, "*extension*")
     )]
  [file where event.action in ("modification", "creation") and
     file.name != null and file.extension != null and
     process.name != null and
     process.name in ("node", "npm")]

Splunk SPL Query

index=web OR index=proxy OR index=network
  (uri_path="*/cds-mtxs/*" OR uri_path="*/mtx/*" OR uri_path="*extensions*")
  OR (url="*cds-mtxs*" AND url="*tenant*")
  OR (payload="*credentials*" AND payload="*tenant*" AND method="POST")
| eval indicator=case(
    match(uri_path, "(?i)(tenant|extension|mtx)") AND match(method, "POST"), "CVE-2026-76969_candidate_attempt",
    match(user_agent, "(?i)(curl|python-requests|go-http-client)") AND match(uri_path, "(?i)cds-mtxs"), "CVE-2026-76969_suspicious_ua",
    1=1, "normal"
  )
| where indicator != "normal"
| stats count min(_time) as earliest max(_time) as latest by src_ip, uri_path, status_code, indicator
| table src_ip uri_path status_code indicator count earliest latest
| sort -count

Wazuh OSSEC Rule

<group name="sap_cap,">
    <rule id="76969" level="15">
        <if_sid>1000</if_sid>
        <match>cds-mtxs</match>
        <description>SAP CAP cds-mtxs endpoint accessed without authentication - possible CVE-2026-76969 exploitation.</description>
        <group>cve,exploit_attempt,sap_cap,</group>
        <url>https://nvd.nist.gov/vuln/detail/CVE-2026-76969</url>
        <mitre>
            <id>T1190</id>
        </mitre>
    </rule>
    <rule id="76970" level="12">
        <program_name>node|npm</program_name>
        <match>tenant|extension</match>
        <regex>credentials|password|secret</regex>
        <description>Anomalous credential-related activity in SAP CAP application process.</description>
        <group>cve,cwe_522,</group>
    </rule>
    <rule id="76971" level="10">
        <if_sid>76970</if_sid>
        <url>/mtx/</url>
        <description>Credential access in cds-mtxs extension endpoint - high confidence CVE-2026-76969 indicator.</description>
    </rule>
</group>

Mitigation & Patch Guidance

Patch status: No patch is available. Patch confidence is 0/4 from all tracked sources. SAP or the @sap/cds-mtxs maintainer has not yet published a fixed release, a vendor security note, or a workaround at the time of this report.

Immediate mitigations (no patch):

1. Network segmentation: Restrict network access to CAP applications employing @sap/cds-mtxs — limit exposure of the application's public endpoints at least until exploitation posture is understood. If the extension-management endpoints are not consumed from the public internet, block them at the WAF/gateway level.
2. Authentication at the edge: Place an identity-aware reverse proxy in front of any CAP application using @sap/cds-mtxs to enforce a layer of authentication that the library's vulnerable internal checks are not performing.
3. Credential rotation: If the prerequisite assumptions hold — namely, that the library stores sensitive credentials accessible through the flawed check — rotate any database credentials, service bindings, or tenant keys used by the affected library. Because attackers may have harvested these prior to your detection, rotation is a defensive action independent of observed compromise.
4. Data backup & integrity monitoring: For multitenant data stores, enable continuous backup and implement integrity checks (hash comparison, database audit triggers, or application-level read-back verification) to detect partial replacement or deletion early.
5. Monitor tenant lifecycle operations: Increase log verbosity for tenant create/delete/update operations in CAP applications. Since the vulnerability's downstream effect is tenant data replacement/deletion, anomalous tenant-management transactions become a strong secondary indicator.

Patch / upgrade steps (once available):

• Track the @sap/cds-mtxs package on the npm registry and the SAP Security Patch Day notes for an advisory referencing CVE-2026-76969.
• When a patched version is released, upgrade all affected CAP applications. Before deployment, review the package's changelog to confirm the specific flaw addressed and whether migration of tenant extension data is required.
• After patching, audit all tenant data for unexpected modifications performed during the vulnerable window.

Long-term hardening:

• Least privilege for service credentials: Ensure that database credentials issued to CAP applications use row-level and schema-level permissions narrowly scoped to the data each tenant needs.
• Secrets management: Migrate tenant credentials out of application-embedded storage into a dedicated secrets manager (e.g., SAP BTP Credential Store, Vault, or cloud KMS) where access is centrally audited.
• Patch-cadence review: For NPM packages that orchestrate security-sensitive multi-tenant boundaries, add them to a dependency-alerting pipeline that notifies at the moment an advisory is published (SAP frequently issues bundled security notes).
• Multi-tenant isolation review: Use the opportunity of this CVE to audit how tenant boundaries are enforced in the CAP application: verify headers are not solely trusted for tenant isolation, verify that database connections are truly per-tenant and not shared with broad roles, and verify that extension bundles are signature-validated before deployment.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2026-76969 — Official CVE record with NVD description, CVSS vector, and CWE classification.
2. SAP Security Advisory Portal: https://support.sap.com/en/my-support/knowledge-base.html — Monitor this portal for the forthcoming SAP Security Note covering CVE-2026-76969; no vendor advisory was published as of the analysis date.
3. NPM Package Registry — @sap/cds-mtxs: https://www.npmjs.com/package/@sap/cds-mtxs — Reference for version history, changelog, and eventual patched release notification.
4. SAP CAP Documentation: https://cap.cloud.sap/docs/guides/multitenancy/extensibility — Vendor documentation describing the intended behavior and security boundaries of the extensibility model in multitenant CAP applications.
5. CISA Known Exploited Vulnerabilities: https://www.cisa.gov/known-exploited-vulnerabilities-catalog — CVE-2026-76969 is not listed, confirming no known in-the-wild exploitation as of the report date.

Report classification: TLP:CLEAR — Distribution unlimited.

This report was generated by Valtersit Threat Intelligence and is based on the publicly available NVD description for CVE-2026-76969. Where the source data is sparse, the analysis explicitly states the inference basis and does not present speculation as fact. No technical claim in this report that cannot be sourced to the NVD description, CWE, or CVSS vector should be treated as confirmed vendor disclosure.