CVE-2026-1131 is a SQL injection vulnerability identified in Yonyou KSOA version 9.0, specifically within the /kmc/save_catalog.jsp component. The vulnerability arises from improper sanitization of the 'catalogid' HTTP GET parameter, allowing attackers to inject malicious SQL code. This injection flaw can be exploited remotely without authentication or user interaction, making it highly accessible to attackers. The vulnerability enables attackers to manipulate backend database queries, potentially leading to unauthorized data disclosure, data modification, or deletion. The vendor has been notified but has not responded or provided a patch, and public exploit code has been disclosed, increasing the likelihood of exploitation. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low attack complexity, no privileges or user interaction required, but limited impact on confidentiality, integrity, and availability. The vulnerability affects a critical component of Yonyou KSOA, an enterprise software suite widely used in business process automation, which may contain sensitive corporate data. Without remediation, affected systems remain vulnerable to targeted attacks that can compromise data integrity and confidentiality.

For European organizations, exploitation of CVE-2026-1131 could lead to unauthorized access to sensitive business data, including intellectual property, customer information, and internal catalogs managed by Yonyou KSOA. This can result in data breaches, financial losses, reputational damage, and potential regulatory penalties under GDPR due to unauthorized data exposure. The ability to remotely exploit the vulnerability without authentication increases the risk of widespread attacks, especially in sectors where Yonyou KSOA is integrated into critical business workflows. Additionally, attackers could alter or delete data, disrupting business operations and causing availability issues. The lack of vendor response and patch availability exacerbates the risk, forcing organizations to rely on compensating controls. European companies in manufacturing, finance, and government sectors using Yonyou products are particularly vulnerable, as these sectors often handle sensitive data and have complex supply chains that could be targeted for espionage or sabotage.

1. Immediately implement strict input validation and sanitization on the 'catalogid' parameter at the application or web server level to block malicious SQL payloads. 2. Deploy a web application firewall (WAF) with custom rules to detect and block SQL injection attempts targeting the vulnerable endpoint. 3. Conduct thorough code reviews and security testing of all JSP files and parameters to identify and remediate similar injection flaws. 4. Monitor logs and network traffic for unusual queries or access patterns related to /kmc/save_catalog.jsp and the 'catalogid' parameter. 5. Isolate or segment systems running Yonyou KSOA to limit lateral movement in case of compromise. 6. Engage with Yonyou or third-party security vendors for potential patches or workarounds, and track updates closely. 7. Educate IT and security teams about this vulnerability and ensure incident response plans include steps for SQL injection attacks. 8. Consider temporary disabling or restricting access to the vulnerable functionality if feasible until a patch is available.