CVE-2026-0493: SAP Fiori CSRF Vulnerability

CVE-2026-0493 Overview

A Cross-Site Request Forgery (CSRF) vulnerability has been identified in the SAP Fiori App Intercompany Balance Reconciliation. This security flaw allows attackers to execute state-changing actions using an inappropriate request type. By exploiting this deviation from expected request semantics, an attacker can trigger unintended actions on behalf of an authenticated user, causing impact to the integrity of the system. According to SAP's assessment, this vulnerability has no impact on confidentiality and availability.

Critical Impact

Authenticated users of SAP Fiori App Intercompany Balance Reconciliation may unknowingly execute malicious state-changing operations when tricked into visiting attacker-controlled content, potentially affecting business data integrity.

Affected Products

• SAP Fiori App Intercompany Balance Reconciliation

Discovery Timeline

• January 13, 2026 - CVE-2026-0493 published to NVD
• January 13, 2026 - Last updated in NVD database

Technical Details for CVE-2026-0493

Vulnerability Analysis

This CSRF vulnerability (CWE-352) exists in the SAP Fiori App Intercompany Balance Reconciliation due to insufficient validation of request origins and improper handling of request types. The application fails to adequately verify that state-changing requests originate from legitimate user interactions within the application context.

CSRF attacks exploit the trust that a web application has in an authenticated user's browser. When the SAP Fiori App accepts state-changing actions without proper anti-CSRF token validation or request method enforcement, attackers can craft malicious requests that execute operations with the victim's session credentials.

The vulnerability specifically relates to the use of inappropriate request types for state-changing operations. Proper REST API design dictates that state-changing operations should use POST, PUT, or DELETE methods with proper CSRF protection, while GET requests should be reserved for idempotent read operations.

Root Cause

The root cause of this vulnerability is the absence or improper implementation of CSRF protection mechanisms in the SAP Fiori App Intercompany Balance Reconciliation. The application accepts state-changing requests without adequately validating:

• Anti-CSRF tokens (synchronizer tokens)
• Request origin headers
• Request method appropriateness for the operation type

This allows attackers to construct requests that the application processes as legitimate user actions.

Attack Vector

The attack vector is network-based, requiring the attacker to trick an authenticated user into visiting a malicious page or clicking a crafted link. The attack scenario typically involves:

1. The victim authenticates to the SAP Fiori App Intercompany Balance Reconciliation
2. While maintaining an active session, the victim visits an attacker-controlled website or opens a malicious email
3. The attacker's page contains hidden forms or JavaScript that automatically submits requests to the vulnerable SAP application
4. The victim's browser includes session cookies with the forged request
5. The SAP application processes the request as a legitimate action from the authenticated user

The exploitation requires low privileges (authenticated user access) and no user interaction beyond the initial visit to the malicious content. Due to the nature of this vulnerability, attackers can potentially modify intercompany balance reconciliation data or trigger business workflows without the user's knowledge.

Detection Methods for CVE-2026-0493

Indicators of Compromise

• Unusual or unexpected modifications to intercompany balance reconciliation records
• State-changing operations originating from unexpected referrer URLs or with missing origin headers
• Multiple rapid-fire requests from authenticated sessions with timing patterns inconsistent with normal user behavior
• Audit log entries showing legitimate user accounts performing actions the users deny initiating

Detection Strategies

• Monitor web server logs for state-changing requests lacking proper CSRF tokens or with suspicious referrer headers
• Implement Web Application Firewall (WAF) rules to detect requests with missing or invalid origin headers for sensitive endpoints
• Enable detailed audit logging for all state-changing operations in SAP Fiori applications
• Deploy user and entity behavior analytics (UEBA) to identify anomalous patterns in user activity

Monitoring Recommendations

• Configure SAP Security Audit Log to capture all modifications to intercompany balance reconciliation data
• Implement real-time alerting for state-changing operations that fail CSRF validation checks
• Monitor for users reporting unauthorized actions performed under their accounts
• Review HTTP referrer and origin header patterns for requests to the affected SAP Fiori application

How to Mitigate CVE-2026-0493

Immediate Actions Required

• Apply the security patch provided in SAP Note 3655229 immediately
• Review SAP Security Patch Day for additional guidance and related patches
• Audit recent transactions in the Intercompany Balance Reconciliation application for unauthorized modifications
• Implement additional monitoring for the affected application until patching is complete

Patch Information

SAP has addressed this vulnerability through SAP Note 3655229. Organizations should apply this patch as part of their regular SAP Security Patch Day maintenance cycle. The patch implements proper CSRF protection mechanisms to ensure state-changing requests are validated against legitimate user sessions.

For detailed patching instructions and system requirements, refer to the official SAP documentation. Testing in a non-production environment is recommended before deploying to production systems.

Workarounds

• Implement strict Content Security Policy (CSP) headers to limit the sources from which the application can load resources
• Configure Web Application Firewall rules to validate request origins for state-changing endpoints
• Enforce SameSite cookie attributes to prevent cross-origin request forgery via browser-level protections
• Educate users about the risks of clicking unknown links while authenticated to business-critical SAP applications