CVE-2026-1124 identifies a SQL injection vulnerability in Yonyou KSOA version 9.0, specifically within the HTTP GET parameter handler of the /worksheet/work_report.jsp file. The vulnerability arises from improper sanitization of the 'ID' parameter, allowing attackers to inject malicious SQL code remotely without authentication or user interaction. This flaw enables attackers to execute arbitrary SQL queries against the backend database, potentially leading to unauthorized data disclosure, data modification, or deletion, and in some cases, full system compromise depending on database privileges. The vulnerability has a CVSS 4.0 base score of 6.9, reflecting medium severity, with network attack vector, low complexity, no privileges or user interaction required, and limited impact on confidentiality, integrity, and availability. The vendor Yonyou has not responded or provided patches, and public exploit code is available, increasing the risk of exploitation. The lack of vendor response complicates mitigation, requiring organizations to implement compensating controls. The vulnerability affects only version 9.0 of KSOA, a business management software suite widely used in China and increasingly adopted by multinational companies. The attack surface is the web application interface, making it accessible to remote attackers. The exploitation can lead to significant business disruption and data breaches if leveraged by threat actors.

For European organizations using Yonyou KSOA 9.0, this vulnerability poses a significant risk to the confidentiality, integrity, and availability of sensitive business data managed within the application. Successful exploitation could lead to unauthorized data access, including financial records, employee information, or intellectual property, potentially resulting in regulatory non-compliance under GDPR. Data manipulation or deletion could disrupt business operations, causing financial losses and reputational damage. The presence of public exploit code increases the likelihood of attacks, including opportunistic or targeted campaigns. Given the remote and unauthenticated nature of the exploit, attackers can easily scan and compromise vulnerable systems. The lack of vendor patches means organizations must rely on internal mitigations, increasing operational overhead. European companies with supply chain or business relationships involving Chinese firms using Yonyou products may face indirect risks. Additionally, attackers could leverage this vulnerability as a foothold for further network intrusion or lateral movement within corporate environments.

Since no official patch is available, European organizations should implement immediate compensating controls. First, apply strict input validation and sanitization on all user-supplied parameters, especially the 'ID' parameter in /worksheet/work_report.jsp, to block malicious SQL payloads. Deploy and configure Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting this endpoint. Conduct thorough code reviews and penetration testing to identify and remediate similar injection points in the application. Restrict database user privileges to the minimum necessary, preventing attackers from executing destructive queries even if injection occurs. Monitor database logs and web server access logs for unusual query patterns or repeated access attempts to the vulnerable parameter. Network segmentation can limit the impact of a successful exploit. Organizations should also consider isolating or temporarily disabling the vulnerable functionality if feasible until a vendor patch is released. Finally, maintain up-to-date backups to enable recovery from potential data loss or corruption.