CVE-2025-15421 is a remote SQL injection vulnerability affecting Yonyou KSOA version 9.0, located in the HTTP GET parameter handler of the /worksheet/agent_worksadd.jsp component. The vulnerability arises from improper sanitization of the 'ID' parameter, allowing attackers to inject malicious SQL queries directly into the backend database. This flaw enables unauthenticated remote attackers to execute arbitrary SQL commands, potentially leading to unauthorized data disclosure, data modification, or denial of service. The vulnerability does not require user interaction or privileges, making exploitation straightforward once the attacker can send crafted HTTP GET requests. The vendor has not issued a patch or response despite early notification, and exploit code is publicly available, increasing the risk of exploitation. The CVSS 4.0 score of 6.9 reflects medium severity, with low individual impacts on confidentiality, integrity, and availability but combined can result in significant compromise. The lack of vendor response and patch availability necessitates immediate defensive measures by affected organizations. Yonyou KSOA is widely used in enterprise resource planning and office automation systems, particularly in China and other Asian markets, making organizations in these regions more vulnerable. The vulnerability's exploitation could lead to data breaches, operational disruption, and reputational damage.

The SQL injection vulnerability in Yonyou KSOA 9.0 can have serious consequences for organizations worldwide using this software. Successful exploitation allows attackers to access, modify, or delete sensitive data stored in the backend database without authentication. This can lead to data breaches involving confidential business information, intellectual property, or personal data, potentially violating data protection regulations. Attackers could also manipulate data integrity, causing operational disruptions or financial inaccuracies. The vulnerability's remote and unauthenticated nature increases the attack surface and ease of exploitation. Although the CVSS score is medium, the real-world impact could be significant, especially for organizations relying heavily on Yonyou KSOA for critical business processes. The absence of a vendor patch and public availability of exploit code further elevate the risk. Organizations may face regulatory penalties, loss of customer trust, and operational downtime if exploited.

1. Implement strict input validation and sanitization on all HTTP GET parameters, especially the 'ID' parameter in /worksheet/agent_worksadd.jsp, to block malicious SQL payloads. 2. Deploy a Web Application Firewall (WAF) with rules specifically designed to detect and block SQL injection attempts targeting Yonyou KSOA endpoints. 3. Monitor web server and application logs for unusual or suspicious requests containing SQL injection patterns and respond promptly. 4. Restrict database user permissions used by the application to the minimum necessary, limiting the potential damage of SQL injection exploitation. 5. Isolate the affected application in a segmented network zone to reduce lateral movement if compromised. 6. Engage with Yonyou support channels regularly to obtain updates or patches and apply them promptly once available. 7. Consider temporary mitigation by disabling or restricting access to the vulnerable endpoint if business operations allow. 8. Conduct regular security assessments and penetration testing focused on injection vulnerabilities to identify and remediate similar issues proactively.