CVE-2026-1177: Yonyou KSOA 9.0 SQL Injection Vulnerability

CVE-2026-1177 Overview

A SQL injection vulnerability has been identified in Yonyou KSOA 9.0 affecting the /kmf/save_folder.jsp file within the HTTP GET Parameter Handler component. The vulnerability allows remote attackers to execute arbitrary SQL commands by manipulating the folderid parameter. This injection flaw enables unauthorized access to backend database systems, potentially compromising data integrity and confidentiality.

Critical Impact
Remote attackers can exploit this SQL injection vulnerability to access, modify, or delete sensitive data in the backend database without authentication.

Affected Products

Yonyou KSOA 9.0
HTTP GET Parameter Handler component
/kmf/save_folder.jsp endpoint

Discovery Timeline

2026-01-19 - CVE-2026-1177 published to NVD
2026-01-19 - Last updated in NVD database

Technical Details for CVE-2026-1177

Vulnerability Analysis

This vulnerability resides in the /kmf/save_folder.jsp file of the Yonyou KSOA 9.0 application. The HTTP GET Parameter Handler fails to properly sanitize user-supplied input in the folderid parameter before incorporating it into SQL queries. This classic injection pattern allows attackers to break out of the intended query structure and execute arbitrary SQL statements against the underlying database.

The exploit has been publicly disclosed and could be weaponized for attacks. According to public vulnerability databases, the vendor was contacted about this vulnerability but did not respond, leaving users without an official patch or remediation guidance.

Root Cause

The root cause is classified under CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component), commonly known as injection. The application fails to implement proper input validation and parameterized queries for the folderid parameter. When user-controlled data is directly concatenated into SQL query strings without sanitization or prepared statements, attackers can inject malicious SQL syntax that alters the query's intended behavior.

Attack Vector

The attack can be executed remotely over the network without requiring any authentication or user interaction. An attacker sends a crafted HTTP GET request to the vulnerable /kmf/save_folder.jsp endpoint with a malicious payload in the folderid parameter. The injected SQL code is then executed by the database server with the privileges of the application's database user.

The attack follows this pattern: the attacker identifies the vulnerable parameter, crafts SQL injection payloads to probe the database structure, and then extracts or manipulates data depending on their objectives. Common exploitation techniques include UNION-based injection, boolean-based blind injection, and time-based blind injection.

For technical details regarding exploitation methods, refer to the GitHub Issue for CVE-17 or VulDB entry #341771.

Detection Methods for CVE-2026-1177

Indicators of Compromise

Unusual SQL error messages in application logs from /kmf/save_folder.jsp
HTTP GET requests to /kmf/save_folder.jsp containing SQL syntax characters (single quotes, double dashes, semicolons, UNION keywords)
Database query logs showing unexpected SELECT, INSERT, UPDATE, or DELETE operations
Abnormal database connection patterns or query execution times

Detection Strategies

Deploy Web Application Firewall (WAF) rules to detect SQL injection patterns in the folderid parameter
Implement application-layer logging for all requests to /kmf/save_folder.jsp and analyze for injection attempts
Configure database audit logging to track queries executed by the KSOA application user
Use intrusion detection systems (IDS) with signatures for common SQL injection patterns

Monitoring Recommendations

Monitor web server access logs for requests containing encoded or obfuscated SQL injection payloads
Set up alerts for database errors or exceptions generated by malformed queries
Track any unauthorized data access or modification patterns in database audit trails
Regularly review application logs for reconnaissance activity targeting JSP endpoints

How to Mitigate CVE-2026-1177

Immediate Actions Required

Restrict network access to the /kmf/save_folder.jsp endpoint using firewall rules or access control lists
Deploy a Web Application Firewall (WAF) with SQL injection protection enabled for the affected endpoint
Implement input validation at the network perimeter to block requests with SQL injection patterns
Consider temporarily disabling or restricting access to the vulnerable functionality if business operations allow

Patch Information

No official patch is currently available from the vendor. According to the vulnerability disclosure, the vendor (Yonyou) was contacted about this issue but did not respond. Organizations using Yonyou KSOA 9.0 should contact the vendor directly for remediation guidance and monitor for future security updates.

For additional details, see the VulDB CTI entry and VulDB submission #734577.

Workarounds

Implement a reverse proxy or WAF rule to sanitize or block malicious input in the folderid parameter
Apply network segmentation to limit access to the KSOA application from untrusted networks
Use database account permissions to restrict the application's database user to minimum required privileges
Enable prepared statements or parameterized queries at the application level if custom modifications are possible

bash

# Example WAF rule for blocking SQL injection attempts (ModSecurity)
SecRule ARGS:folderid "@detectSQLi" \
    "id:100001,\
    phase:2,\
    deny,\
    status:403,\
    log,\
    msg:'SQL Injection attempt detected in folderid parameter',\
    tag:'CVE-2026-1177'"