CVE-2026-1120 is a medium-severity SQL injection vulnerability affecting Yonyou KSOA version 9.0, a business application platform. The vulnerability resides in the /worksheet/del_work.jsp endpoint, where the HTTP GET parameter 'ID' is improperly sanitized, allowing an attacker to inject malicious SQL code. This flaw can be exploited remotely without requiring authentication or user interaction, making it relatively easy to exploit. Successful exploitation could lead to unauthorized data access, modification, or deletion, impacting the confidentiality, integrity, and availability of the backend database. The CVSS 4.0 vector indicates no privileges or user interaction are needed, with partial impact on all three security properties. The vendor was informed but has not responded or issued a patch, and while no active exploits have been reported, the public disclosure increases the risk of future attacks. The vulnerability affects a critical component of the Yonyou KSOA system, which is widely used in enterprise environments, especially in China and the Asia-Pacific region. Given the lack of vendor remediation, organizations must rely on defensive controls and monitoring to mitigate potential exploitation.

The impact of CVE-2026-1120 can be significant for organizations using Yonyou KSOA 9.0. Exploitation allows attackers to execute arbitrary SQL commands on the backend database remotely, potentially leading to unauthorized data disclosure, data tampering, or deletion. This compromises the confidentiality, integrity, and availability of sensitive business data managed by the platform. Since the vulnerability requires no authentication or user interaction, it can be exploited by any remote attacker with network access to the affected endpoint, increasing the attack surface. Organizations may face operational disruptions, data breaches, and compliance violations if exploited. The absence of a vendor patch exacerbates the risk, as organizations must implement compensating controls. The threat is particularly critical for enterprises relying heavily on Yonyou KSOA for workflow and business process management, especially in sectors with sensitive or regulated data.

To mitigate CVE-2026-1120, organizations should implement the following specific measures: 1) Apply strict input validation and sanitization on the 'ID' parameter at the web application level to prevent injection of malicious SQL code. 2) Deploy a Web Application Firewall (WAF) with custom rules to detect and block SQL injection attempts targeting the /worksheet/del_work.jsp endpoint. 3) Restrict network access to the affected application to trusted IP ranges and enforce strong network segmentation to limit exposure. 4) Monitor database logs and application logs for unusual queries or error messages indicative of injection attempts. 5) If possible, upgrade or patch the application once the vendor releases a fix; meanwhile, consider isolating the vulnerable component or disabling the affected functionality if feasible. 6) Conduct regular security assessments and penetration testing focused on injection vulnerabilities. 7) Educate development and operations teams on secure coding practices and the importance of parameterized queries or prepared statements to prevent SQL injection.