CVE-2026-27684 Overview
SAP NetWeaver Feedback Notifications Service contains a SQL injection vulnerability (CWE-89) that allows an authenticated attacker to inject arbitrary SQL code through user-controlled input fields. The application concatenates these inputs directly into SQL queries without proper validation or escaping. As a result, an attacker can manipulate the WHERE clause logic and potentially gain unauthorized access to or modify database information.
Critical Impact
Authenticated attackers can exploit this SQL injection flaw to manipulate database queries, potentially accessing sensitive information or affecting system availability. While requiring authentication limits the attack surface, the network-accessible nature of the vulnerability increases exposure risk.
Affected Products
- SAP NetWeaver Feedback Notifications Service
Discovery Timeline
- 2026-03-10 - CVE-2026-27684 published to NVD
- 2026-03-11 - Last updated in NVD database
Technical Details for CVE-2026-27684
Vulnerability Analysis
This SQL injection vulnerability exists within the SAP NetWeaver Feedback Notifications Service. The flaw stems from improper handling of user-supplied input that gets directly concatenated into SQL queries without appropriate sanitization or parameterization. An authenticated attacker can leverage this weakness to inject malicious SQL statements, potentially bypassing authentication checks, extracting sensitive data, or causing denial of service conditions.
The vulnerability affects confidentiality and availability with low impact each, while integrity remains unaffected according to the official assessment. The changed scope indicates that the vulnerable component can affect resources beyond its security scope.
Root Cause
The root cause of CVE-2026-27684 is improper input validation within the Feedback Notifications Service. The application fails to properly sanitize or parameterize user-controlled input before incorporating it into SQL query construction. Instead of using prepared statements or parameterized queries, the application directly concatenates user input into SQL strings, creating the classic conditions for SQL injection attacks.
Attack Vector
The attack vector is network-based, requiring low privileges (authenticated access) but no user interaction. An authenticated attacker can craft malicious input containing SQL metacharacters and injection payloads that modify the intended query logic. By manipulating WHERE clause conditions, attackers can potentially:
- Extract data they should not have access to
- Bypass application-level access controls
- Cause denial of service through resource-intensive queries
- Enumerate database schema and table structures
The vulnerability manifests when user-controlled parameters are passed to the Feedback Notifications Service and processed without proper escaping. For detailed technical information, refer to SAP Note #3697355.
Detection Methods for CVE-2026-27684
Indicators of Compromise
- Unusual SQL error messages appearing in application logs from the Feedback Notifications Service
- Unexpected database queries containing SQL injection patterns such as ' OR 1=1--, UNION SELECT, or ; DROP TABLE
- Authentication anomalies where users access data outside their normal authorization scope
- Increased database query execution times indicating potential time-based blind SQL injection attempts
Detection Strategies
- Monitor SAP NetWeaver application logs for SQL syntax errors and exception traces originating from the Feedback Notifications Service
- Implement Web Application Firewall (WAF) rules to detect common SQL injection patterns in HTTP parameters
- Enable database audit logging to track unusual query patterns and unauthorized data access attempts
- Deploy SentinelOne Singularity to detect exploitation attempts and anomalous database activity
Monitoring Recommendations
- Configure SIEM alerting for SQL error patterns and injection attempt signatures in SAP NetWeaver logs
- Establish baseline database query patterns and alert on significant deviations
- Monitor authenticated user sessions for unusual data access patterns that may indicate successful exploitation
- Review SAP Security Audit Log (SM21) for suspicious authentication and authorization events
How to Mitigate CVE-2026-27684
Immediate Actions Required
- Apply the security patch referenced in SAP Note #3697355 as soon as possible
- Review access controls for the Feedback Notifications Service and restrict to essential personnel only
- Enable enhanced logging for the affected service to detect potential exploitation attempts
- Consider temporarily disabling the Feedback Notifications Service if it is not business-critical until patching is complete
Patch Information
SAP has released a security patch addressing this vulnerability as part of their Security Patch Day program. Organizations should obtain and apply the fix documented in SAP Note #3697355. The SAP Security Patch Day page provides additional guidance on the patching process and affected versions.
Workarounds
- Implement input validation at the application layer to reject known SQL injection patterns
- Deploy a Web Application Firewall (WAF) with SQL injection detection rules in front of SAP NetWeaver
- Restrict network access to the Feedback Notifications Service to trusted IP ranges only
- Review and minimize user permissions to reduce the impact of potential exploitation
# Example: Restrict network access to SAP NetWeaver services
# Add firewall rules to limit access to trusted networks only
# Consult SAP documentation for environment-specific configuration
# Review SAP user authorizations
# Transaction: SU01 - User Maintenance
# Remove unnecessary access to Feedback Notifications Service
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
