CVE-2026-1124: Yonyou KSOA 9.0 SQL Injection Vulnerability

CVE-2026-1124 Overview

A SQL injection vulnerability has been discovered in Yonyou KSOA 9.0, a widely deployed enterprise application platform. The vulnerability exists in the /worksheet/work_report.jsp file within the HTTP GET Parameter Handler component. Attackers can exploit this flaw by manipulating the ID parameter to inject malicious SQL statements, potentially allowing unauthorized access to sensitive database information, data manipulation, or further system compromise.

The vulnerability is remotely exploitable without authentication, and exploit details have been publicly disclosed. The vendor (Yonyou) was contacted regarding this security issue but did not respond.

Critical Impact

Remote SQL injection vulnerability in Yonyou KSOA 9.0 allows unauthenticated attackers to execute arbitrary SQL commands via the ID parameter in /worksheet/work_report.jsp, potentially leading to data theft, modification, or complete database compromise.

Affected Products

• Yonyou KSOA 9.0
• Systems using the /worksheet/work_report.jsp endpoint
• HTTP GET Parameter Handler component

Discovery Timeline

• 2026-01-18 - CVE-2026-1124 published to NVD
• 2026-01-18 - Last updated in NVD database

Technical Details for CVE-2026-1124

Vulnerability Analysis

This SQL injection vulnerability (CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component) occurs due to insufficient input validation in the HTTP GET Parameter Handler component of Yonyou KSOA 9.0. The affected endpoint /worksheet/work_report.jsp fails to properly sanitize user-supplied input in the ID parameter before incorporating it into SQL queries.

When a user makes a request to the vulnerable endpoint, the application directly concatenates the ID parameter value into database queries without proper parameterization or escaping. This allows attackers to inject arbitrary SQL syntax, which the database engine then executes with the same privileges as the application's database user.

The vulnerability is accessible remotely over the network and requires no authentication or user interaction to exploit. The impact includes potential unauthorized access to confidential data, ability to modify or delete database records, and in some configurations, possible execution of operating system commands through database-specific features.

Root Cause

The root cause of this vulnerability is the lack of proper input validation and sanitization in the HTTP GET Parameter Handler component. The application fails to:

1. Validate that the ID parameter contains only expected data types (such as numeric values)
2. Use parameterized queries or prepared statements to handle user input
3. Implement proper escaping or encoding of special SQL characters before query construction

This allows malicious SQL syntax embedded in the ID parameter to be interpreted as part of the SQL query structure rather than as literal data.

Attack Vector

The attack vector for CVE-2026-1124 is network-based, targeting the /worksheet/work_report.jsp endpoint. An attacker crafts a malicious HTTP GET request containing SQL injection payload in the ID parameter. The vulnerable application passes this unsanitized input directly to the database, where the injected SQL commands are executed.

Successful exploitation can enable attackers to bypass authentication, extract sensitive information from the database, modify or delete data, and potentially escalate privileges within the application or underlying system. Since the exploit has been publicly released, organizations running Yonyou KSOA 9.0 face increased risk of opportunistic attacks.

The attack requires no authentication and can be performed remotely by any attacker with network access to the vulnerable endpoint. For detailed technical information, refer to the GitHub CVE Issue Discussion and VulDB #341716.

Detection Methods for CVE-2026-1124

Indicators of Compromise

• Unusual or malformed requests to /worksheet/work_report.jsp containing SQL syntax in the ID parameter
• Database error messages in application logs indicating SQL syntax errors or unexpected query behavior
• Unexpected database queries containing UNION, SELECT, INSERT, UPDATE, DELETE, or DROP statements
• Anomalous database access patterns including bulk data extraction or schema enumeration

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block SQL injection patterns in HTTP GET parameters
• Monitor application logs for requests to /worksheet/work_report.jsp with suspicious ID parameter values
• Deploy intrusion detection systems (IDS) with signatures for common SQL injection attack patterns
• Enable database audit logging to capture and alert on unusual query structures or unauthorized data access

Monitoring Recommendations

• Configure real-time alerting for SQL injection attack patterns targeting the affected endpoint
• Establish baseline query patterns for the application and alert on deviations
• Monitor for authentication bypass attempts and unauthorized access to sensitive data
• Review web server access logs for reconnaissance activity targeting JSP endpoints

How to Mitigate CVE-2026-1124

Immediate Actions Required

• Restrict network access to the /worksheet/work_report.jsp endpoint to trusted IP addresses only
• Implement web application firewall (WAF) rules to filter SQL injection patterns in the ID parameter
• Consider disabling or removing the vulnerable endpoint if not business-critical
• Enable enhanced logging and monitoring for the affected component to detect exploitation attempts

Patch Information

As of the last update on 2026-01-18, no official patch has been released by Yonyou for this vulnerability. The vendor was contacted about this security issue but did not respond. Organizations should monitor the VulDB entry and vendor communications for patch availability. Until an official fix is provided, implementing the recommended workarounds and compensating controls is strongly advised.

Workarounds

• Deploy a web application firewall (WAF) with SQL injection detection rules in front of the Yonyou KSOA application
• Implement network segmentation to limit access to the vulnerable endpoint from untrusted networks
• Use reverse proxy configurations to validate and sanitize the ID parameter before forwarding requests
• If possible, implement input validation at the application layer using a custom filter or module

# Example WAF rule for Apache ModSecurity to block SQL injection in ID parameter
SecRule ARGS:ID "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in ID parameter - CVE-2026-1124',\
    tag:'application-multi',\
    tag:'language-multi',\
    tag:'platform-multi',\
    tag:'attack-sqli'"