CVE-2026-1133: Yonyou KSOA 9.0 SQL Injection Vulnerability

CVE-2026-1133 Overview

A SQL injection vulnerability has been identified in Yonyou KSOA 9.0, affecting the /kmf/folder.jsp endpoint within the HTTP GET Parameter Handler component. The vulnerability allows remote attackers to inject malicious SQL statements through manipulation of the folderid parameter, potentially enabling unauthorized access to sensitive database information, data manipulation, or further system compromise.

Critical Impact

Remote attackers can exploit this SQL injection vulnerability without authentication to extract, modify, or delete database contents, potentially compromising the integrity and confidentiality of business-critical data managed by Yonyou KSOA.

Affected Products

• Yonyou KSOA 9.0

Discovery Timeline

• 2026-01-19 - CVE-2026-1133 published to NVD
• 2026-01-19 - Last updated in NVD database

Technical Details for CVE-2026-1133

Vulnerability Analysis

This vulnerability represents a classic SQL injection flaw (CWE-74: Injection) in the Yonyou KSOA enterprise application. The affected endpoint /kmf/folder.jsp fails to properly sanitize user-supplied input in the folderid HTTP GET parameter before incorporating it into SQL queries. This allows attackers to inject arbitrary SQL syntax that gets executed against the backend database.

The network-accessible nature of this vulnerability means that any attacker with network access to the Yonyou KSOA application can attempt exploitation without requiring prior authentication. The exploit has been publicly disclosed, increasing the likelihood of opportunistic attacks against unpatched systems.

Root Cause

The root cause is improper input validation and lack of parameterized queries in the folder.jsp file. The folderid parameter is directly concatenated into SQL statements without proper sanitization or the use of prepared statements, enabling SQL injection attacks. This represents a fundamental secure coding failure where user-controlled input flows directly into database queries.

Attack Vector

The attack vector is network-based, requiring the attacker to send specially crafted HTTP GET requests to the vulnerable /kmf/folder.jsp endpoint. By manipulating the folderid parameter with SQL injection payloads, an attacker can alter the logic of database queries to extract sensitive information, bypass authentication mechanisms, modify database records, or potentially escalate to command execution depending on the database configuration.

A typical attack scenario involves crafting malicious values for the folderid parameter that break out of the intended query context and inject additional SQL commands. The injected SQL can be used to enumerate database structure, extract user credentials, or dump entire database tables. Technical details and proof-of-concept information are available in the GitHub CVE Issue Discussion.

Detection Methods for CVE-2026-1133

Indicators of Compromise

• Unusual HTTP GET requests to /kmf/folder.jsp containing SQL syntax characters such as single quotes, double dashes, semicolons, or UNION SELECT statements in the folderid parameter
• Database error messages appearing in application logs or HTTP responses indicating SQL syntax errors
• Unexpected database queries or query patterns in database audit logs
• Evidence of data exfiltration or unauthorized database access attempts

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect and block SQL injection patterns in HTTP GET parameters targeting /kmf/folder.jsp
• Enable detailed logging on the web application and database servers to capture suspicious query patterns
• Deploy intrusion detection systems (IDS) with signatures for common SQL injection attack patterns
• Monitor for anomalous database query behavior including unusual query volumes or access to sensitive tables

Monitoring Recommendations

• Configure alerts for HTTP requests containing SQL injection indicators such as ' OR 1=1, UNION SELECT, --, or encoded variants targeting the KSOA application
• Establish baseline database query patterns and alert on deviations that may indicate exploitation attempts
• Implement real-time log analysis for the Yonyou KSOA application to identify attack patterns
• Monitor database account activity for signs of unauthorized data access or privilege escalation

How to Mitigate CVE-2026-1133

Immediate Actions Required

• Restrict network access to the Yonyou KSOA application to trusted IP addresses only until a patch is available
• Implement WAF rules to block SQL injection attempts targeting the /kmf/folder.jsp endpoint
• Review database permissions and apply the principle of least privilege to limit potential damage from successful exploitation
• Enable comprehensive logging and monitoring to detect exploitation attempts

Patch Information

At the time of disclosure, Yonyou has not responded to responsible disclosure attempts and no official patch is available. Organizations should contact Yonyou directly for updated security guidance and monitor VulDB #341723 for updates regarding vendor response and patch availability.

Workarounds

• Deploy a Web Application Firewall with strict input validation rules to filter malicious SQL injection payloads from the folderid parameter
• If feasible, implement access controls to restrict access to /kmf/folder.jsp to authenticated and authorized users only
• Consider implementing a reverse proxy with input sanitization capabilities in front of the KSOA application
• Temporarily disable or restrict the affected functionality if business operations permit

# Example WAF rule (ModSecurity format) to block SQL injection in folderid parameter
SecRule ARGS:folderid "@detectSQLi" \
    "id:1001,\
    phase:2,\
    block,\
    msg:'SQL Injection attempt detected in folderid parameter - CVE-2026-1133',\
    logdata:'Matched Data: %{MATCHED_VAR} found within %{MATCHED_VAR_NAME}',\
    severity:'CRITICAL'"