CVE-2026-44766: SAP S/4HANA SQL Injection Vulnerability

CVE-2026-44766 Overview

CVE-2026-44766 is a SQL injection vulnerability in the SAP S/4HANA Intercompany Matching and Reconciliation (ICMR) component. A low-privileged authenticated user can inject malicious input into specific functions that pass data to the backend database without proper validation. Successful exploitation exposes sensitive information stored in the database. The vulnerability affects confidentiality only, with no impact on integrity or availability. SAP published the fix through SAP Note #3756450 as part of its Security Patch Day release. The issue is classified under [CWE-89] Improper Neutralization of Special Elements used in an SQL Command.

Critical Impact
Authenticated attackers can extract sensitive financial and business data from SAP S/4HANA databases through crafted input to ICMR functions.

Affected Products

SAP S/4HANA (Intercompany Matching and Reconciliation module)
Specific fixed versions are enumerated in SAP Note #3756450
Deployments exposing ICMR functionality to authenticated business users

Discovery Timeline

2026-09-08 - CVE-2026-44766 published to NVD
2026-09-08 - SAP releases security patch via SAP Note #3756450 on SAP Security Patch Day
2026-09-08 - Last updated in NVD database

Technical Details for CVE-2026-44766

Vulnerability Analysis

The vulnerability resides in the Intercompany Matching and Reconciliation (ICMR) functionality of SAP S/4HANA. ICMR helps enterprises reconcile transactions between subsidiaries, and its functions accept user-supplied parameters to filter, match, and query financial records. Certain ICMR functions pass these parameters into database queries without sufficient sanitization or parameterization.

An authenticated user with low privileges can craft input that alters the intended SQL statement. The database executes the modified query and returns data the user is not authorized to see. Because the S/4HANA database typically stores general ledger entries, vendor and customer master data, and cross-company financial transactions, the leaked information can be commercially sensitive.

The flaw affects confidentiality only. The attacker cannot modify records or disrupt service through this specific weakness, but data extraction can enable follow-on attacks such as fraud, insider trading, or targeted social engineering.

Root Cause

The root cause is improper neutralization of special elements used in an SQL command [CWE-89]. Input passed to affected ICMR functions is concatenated into SQL statements without prepared statement binding or strict allow-list validation. This permits the injected fragment to change query semantics at execution time.

Attack Vector

Exploitation requires network access to the SAP S/4HANA application and valid credentials for a low-privileged business account. No user interaction is required. The attacker submits crafted parameters through the standard interface exposed by the vulnerable ICMR function. The database returns rows outside the caller's intended scope. See SAP Note #3756450 for the specific affected functions and technical remediation details.

Detection Methods for CVE-2026-44766

Indicators of Compromise

Unusual SQL syntax fragments (UNION SELECT, OR 1=1, comment markers like -- or /*) appearing in ICMR function parameters within SAP application logs
Unexpected read access from low-privileged users to intercompany reconciliation tables or unrelated financial data
Anomalous spikes in query result sizes or execution times for ICMR-related database calls
Access patterns from a single user account touching multiple company codes outside their normal scope

Detection Strategies

Enable SAP Security Audit Log (SM19/SM20) and monitor ICMR transaction codes and OData services for abnormal parameter values
Correlate HANA SQL trace or expensive statement trace output against known ICMR function signatures to identify malformed queries
Deploy database activity monitoring rules that flag suspicious SQL keywords originating from application-tier accounts
Baseline normal ICMR usage per user and alert on statistical deviations in query volume or result cardinality

Monitoring Recommendations

Forward SAP audit logs, HANA traces, and web dispatcher logs to a centralized SIEM for cross-source correlation
Alert on repeated failed queries or SQL error responses returned to end users, which often indicate injection probing
Review authorizations for accounts able to invoke ICMR functions and monitor privilege usage on a scheduled basis

How to Mitigate CVE-2026-44766

Immediate Actions Required

Apply the patch referenced in SAP Note #3756450 as published on SAP Security Patch Day
Inventory all S/4HANA systems using the Intercompany Matching and Reconciliation module and prioritize production environments
Audit user roles that grant access to ICMR transactions and remove entitlements from accounts that do not require them
Review recent SAP audit logs and HANA traces for evidence of injection attempts prior to patching

Patch Information

SAP addressed CVE-2026-44766 through SAP Note #3756450. Administrators must authenticate to the SAP ONE Support Launchpad to download the correction instructions and Support Package details. Apply the note using SNOTE or install the referenced Support Package via SUM. Validate the fix in a non-production system before rolling out to production, and confirm ICMR business processes function correctly post-patch.

Workarounds

Restrict ICMR authorization objects to the minimum set of users required for intercompany reconciliation tasks
Enforce network segmentation so that only authorized business networks can reach the S/4HANA application servers hosting ICMR
Enable and tune SAP UI logging and Read Access Logging (RAL) on affected functions to increase detection fidelity until the patch is applied
Where feasible, temporarily disable exposed ICMR services that are not in active business use