CVE-2026-0501: SAP S/4HANA SQL Injection Vulnerability

CVE-2026-0501 Overview

CVE-2026-0501 is a SQL injection vulnerability in SAP S/4HANA Private Cloud and On-Premise editions, specifically within the Financials General Ledger component. The flaw stems from insufficient input validation that allows an authenticated user to submit crafted SQL queries to the backend database. Successful exploitation enables attackers to read, modify, and delete database records, directly impacting the confidentiality, integrity, and availability of financial data.

Critical Impact
An authenticated low-privilege user can compromise backend financial database contents, including reading sensitive ledger entries, tampering with transactions, and deleting records.

Affected Products

SAP S/4HANA Private Cloud Edition (Financials General Ledger component)
SAP S/4HANA On-Premise Edition (Financials General Ledger component)
Backend database systems integrated with the Financials General Ledger module

Discovery Timeline

2026-01-13 - CVE-2026-0501 published to NVD
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-0501

Vulnerability Analysis

The vulnerability resides in the Financials General Ledger component of SAP S/4HANA. The application fails to properly validate and sanitize user-supplied input before incorporating it into SQL queries executed against the backend database. An authenticated attacker with low privileges can manipulate query parameters to alter the intended SQL statement structure.

The issue is classified under [CWE-89], Improper Neutralization of Special Elements used in an SQL Command. Because the affected module handles financial ledger data, exploitation directly threatens accounting accuracy, audit integrity, and regulatory compliance. The scope is marked as changed, indicating that exploitation can affect resources beyond the vulnerable component's security boundary.

Root Cause

The root cause is insufficient input validation on parameters that are concatenated into SQL queries within the Financials General Ledger module. Without proper parameterization or whitelist-based input filtering, attacker-controlled values are interpreted as SQL syntax rather than data.

Attack Vector

The attack is delivered over the network and requires the attacker to hold valid low-privilege credentials within the SAP environment. No user interaction is needed. After authenticating, the attacker submits crafted requests containing malicious SQL fragments through the vulnerable Financials General Ledger interface. The backend executes the manipulated query, returning sensitive data or applying unauthorized modifications.

No public proof-of-concept exploit has been published, and the vulnerability is not currently listed in the CISA Known Exploited Vulnerabilities catalog. Technical details are restricted to the SAP Note #3687749 and the SAP Security Patch Day advisory.

Detection Methods for CVE-2026-0501

Indicators of Compromise

Unexpected SQL syntax characters such as single quotes, semicolons, UNION, or comment sequences in SAP application request parameters targeting Financials General Ledger transactions
Database audit log entries showing ad-hoc SELECT, UPDATE, or DELETE statements originating from General Ledger service accounts at unusual times
Application-tier error messages referencing malformed SQL or unexpected result sets returned to low-privilege users

Detection Strategies

Enable SAP Security Audit Log (SM19/SM20) with full logging for the Financials General Ledger transactions and review for anomalous parameter content
Deploy database activity monitoring on the backend HANA or supporting database to flag queries that deviate from the application's expected query templates
Correlate authentication events with subsequent General Ledger queries to identify low-privilege accounts issuing high-impact data modifications

Monitoring Recommendations

Forward SAP application and database logs to a centralized analytics platform for query-pattern baselining
Alert on sudden spikes in row counts returned or modified by General Ledger transactions
Track failed and successful logons to SAP accounts that have access to Financials modules, especially from new source addresses

How to Mitigate CVE-2026-0501

Immediate Actions Required

Apply the security correction described in SAP Note #3687749 to all affected SAP S/4HANA Private Cloud and On-Premise systems
Review and tighten authorization roles so that only required users have access to the Financials General Ledger transactions and underlying RFC functions
Rotate credentials for any accounts suspected of misuse and audit recent General Ledger activity for tampering

Patch Information

SAP has issued a security correction through SAP Note #3687749, published as part of the SAP Security Patch Day program. Administrators should consult the SAP Security Patch Day portal for the current patch level applicable to their S/4HANA release and apply the note via standard SAP transport procedures.

Workarounds

Restrict access to the affected Financials General Ledger transactions through SAP authorization objects until the patch is applied
Place SAP application servers behind segmentation controls that limit reachability to trusted internal networks and VPN users
Monitor and rate-limit requests to General Ledger endpoints to reduce opportunities for iterative SQL injection probing

bash

# Configuration example: verify SAP Note 3687749 is implemented
# Run in SAP GUI transaction SNOTE
# 1. Transaction: SNOTE
# 2. Goto -> Download SAP Note -> 3687749
# 3. Implement SAP Note -> select 3687749
# 4. Verify status shows: Completely implemented