CVE-2025-15420 is a SQL injection vulnerability identified in Yonyou KSOA version 9.0, specifically within the /worksheet/agent_work_report.jsp component. The vulnerability stems from insufficient input validation of the 'ID' parameter, which an attacker can manipulate to inject malicious SQL statements. This flaw allows remote attackers to execute arbitrary SQL commands on the backend database without requiring authentication or user interaction, increasing the attack surface significantly. The vulnerability was publicly disclosed on January 2, 2026, with a CVSS 4.0 base score of 6.9 (medium severity), reflecting its network attack vector, low attack complexity, and no privileges or user interaction needed. The vendor, Yonyou, was notified early but has not issued any response or patch, leaving systems exposed. While no known exploits are currently active in the wild, the public disclosure increases the risk of exploitation. SQL injection can lead to unauthorized data disclosure, data manipulation, or denial of service, compromising the confidentiality, integrity, and availability of affected systems. Yonyou KSOA is an enterprise office automation software widely used in various sectors, including government and large enterprises, which may contain sensitive data. The lack of vendor response and patch availability necessitates immediate defensive measures by users. The vulnerability's presence in a web-facing JSP file increases exposure, especially if the application is accessible externally or insufficiently segmented internally.

For European organizations, this vulnerability poses a significant risk to data confidentiality, integrity, and availability. Exploitation could allow attackers to extract sensitive corporate or personal data, modify records, or disrupt business operations by corrupting or deleting database contents. Given Yonyou KSOA's use in enterprise environments, including government and large corporations, a successful attack could lead to regulatory non-compliance (e.g., GDPR violations), financial losses, reputational damage, and operational downtime. The remote, unauthenticated nature of the exploit increases the likelihood of attacks, especially in organizations with internet-facing deployments or insufficient network segmentation. The absence of vendor patches means organizations must rely on compensating controls, increasing operational complexity and risk. Additionally, the public disclosure may attract opportunistic attackers targeting European entities using this software, especially in sectors with high-value data or critical infrastructure dependencies.

1. Immediately restrict access to the /worksheet/agent_work_report.jsp endpoint by implementing network-level controls such as IP whitelisting or VPN-only access to reduce exposure. 2. Deploy and configure Web Application Firewalls (WAFs) with specific rules to detect and block SQL injection attempts targeting the 'ID' parameter. 3. Conduct thorough input validation and sanitization on all user-supplied parameters, particularly the 'ID' argument, if custom application controls are possible. 4. Monitor database logs and application logs for unusual or suspicious SQL queries indicative of injection attempts. 5. Segment the network to isolate the Yonyou KSOA application servers from critical systems and sensitive data repositories. 6. Engage in threat hunting and incident response readiness to detect potential exploitation attempts early. 7. Since no official patch is available, consider applying virtual patching via WAF or other security appliances. 8. Plan for migration or upgrade to a patched version once the vendor releases a fix or consider alternative software solutions if the vendor remains unresponsive. 9. Educate IT and security teams about this vulnerability and ensure rapid response capabilities are in place.