CVE-2026-1120 identifies a SQL injection vulnerability in Yonyou KSOA version 9.0, specifically within the /worksheet/del_work.jsp component. The vulnerability arises from improper sanitization of the 'ID' parameter in HTTP GET requests, allowing attackers to inject arbitrary SQL commands. This injection can be executed remotely without requiring any authentication or user interaction, making it highly accessible to threat actors. The flaw can lead to unauthorized data retrieval, modification, or deletion within the underlying database, impacting confidentiality, integrity, and availability. The vulnerability was responsibly disclosed to the vendor, but no patch or mitigation guidance has been issued, and exploit details have been publicly disclosed. The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P) indicates network attack vector, low attack complexity, no privileges or user interaction needed, and partial impacts on confidentiality, integrity, and availability. The absence of known active exploitation does not reduce the risk, as public exploit information may facilitate future attacks. Yonyou KSOA is an enterprise resource planning (ERP) system widely used in various industries, making this vulnerability significant for organizations relying on this software.

For European organizations, exploitation of this SQL injection vulnerability could lead to unauthorized access to sensitive business data, including financial records, employee information, and operational details stored within Yonyou KSOA databases. Data integrity could be compromised by unauthorized modifications or deletions, potentially disrupting business processes and causing financial losses. Availability of critical ERP functions may be affected if attackers execute destructive SQL commands or cause database corruption. The lack of vendor response and patch availability increases the risk exposure period. Organizations in regulated sectors such as finance, manufacturing, and public administration may face compliance violations and reputational damage if data breaches occur. Additionally, attackers could leverage this vulnerability as a foothold for further network intrusion or lateral movement within corporate environments.

European organizations using Yonyou KSOA 9.0 should immediately implement strict input validation and sanitization controls at the application or web server level to filter and block malicious SQL payloads targeting the 'ID' parameter. Deploying a Web Application Firewall (WAF) with custom rules to detect and block SQL injection attempts against /worksheet/del_work.jsp can provide an effective interim defense. Network segmentation should be enforced to limit access to the affected application components. Organizations should monitor logs for suspicious query patterns and unusual database activities indicative of exploitation attempts. Where possible, restrict access to the vulnerable endpoint to trusted IP addresses or VPN users. Regular database backups and tested recovery procedures are essential to mitigate potential data loss. Engage with Yonyou support channels for updates and consider alternative ERP solutions if timely patches are not forthcoming. Finally, conduct security awareness training for IT staff to recognize and respond to exploitation attempts.