CVE-2026-1131 identifies a SQL injection vulnerability in Yonyou KSOA version 9.0, specifically within the HTTP GET parameter handler for the 'catalogid' argument in the /kmc/save_catalog.jsp file. SQL injection occurs when untrusted input is improperly sanitized, allowing attackers to inject malicious SQL queries that the backend database executes. This vulnerability can be exploited remotely without requiring authentication or user interaction, increasing its risk profile. The attack vector involves crafting a specially designed HTTP GET request that manipulates the 'catalogid' parameter to alter SQL queries, potentially leading to unauthorized data retrieval, modification, or deletion. The CVSS 4.0 score of 6.9 (medium severity) reflects the ease of exploitation (low complexity, no privileges or user interaction required) and the potential impact on confidentiality, integrity, and availability, albeit with limited scope and no scope change. The vendor has been notified but has not issued a patch or response, and no known exploits are currently active in the wild. Organizations using Yonyou KSOA 9.0 should consider this vulnerability a significant risk due to the sensitive nature of enterprise resource planning (ERP) and business process management systems that Yonyou products typically support.

For European organizations, the exploitation of this SQL injection vulnerability could lead to unauthorized access to sensitive business data, including financial records, customer information, and internal catalogs. This can result in data breaches, loss of data integrity, and potential disruption of business operations. Given that Yonyou KSOA is an enterprise software product used in sectors such as manufacturing, finance, and supply chain management, the impact could extend to critical infrastructure and commercial competitiveness. The ability to remotely exploit the vulnerability without authentication increases the risk of widespread attacks, especially if attackers develop automated exploit tools. Data confidentiality could be compromised, leading to regulatory compliance issues under GDPR. Integrity violations could corrupt business data, causing operational errors. Availability might be affected if attackers execute destructive SQL commands or cause database failures. The lack of vendor response and patch availability further exacerbates the risk for European enterprises relying on this software.

European organizations using Yonyou KSOA 9.0 should immediately implement the following mitigations: 1) Apply any available vendor patches or updates as soon as they are released; monitor vendor channels closely given the current lack of response. 2) Implement Web Application Firewall (WAF) rules to detect and block malicious SQL injection payloads targeting the 'catalogid' parameter, using signature and anomaly-based detection. 3) Restrict network access to the affected application endpoints by limiting exposure to trusted IP addresses and internal networks only. 4) Conduct thorough input validation and sanitization on all user-supplied parameters, especially 'catalogid', to prevent injection attacks. 5) Monitor application and database logs for suspicious queries or unusual activity patterns indicative of exploitation attempts. 6) Consider deploying database activity monitoring tools to detect unauthorized SQL commands in real time. 7) If feasible, isolate the affected application environment to minimize lateral movement risk. 8) Educate IT and security teams about this vulnerability to ensure rapid incident response readiness. These steps go beyond generic advice by focusing on compensating controls in the absence of an official patch and emphasizing proactive detection and network-level protections.