CVE-2025-15435 identifies a SQL injection vulnerability in Yonyou KSOA version 9.0, a business software platform widely used for enterprise resource planning and office automation. The vulnerability resides in the /worksheet/work_update.jsp endpoint, where the Report parameter is improperly sanitized, allowing attackers to inject malicious SQL code. This injection flaw can be exploited remotely without authentication or user interaction, enabling attackers to manipulate backend database queries. Potential consequences include unauthorized data disclosure, data modification, or even complete compromise of the database integrity. The vulnerability has been assigned a CVSS 4.0 score of 6.9, reflecting medium severity due to the lack of authentication requirements and ease of exploitation, but limited scope and impact on confidentiality, integrity, and availability. Although an exploit has been published, no active exploitation campaigns have been reported. The vendor, Yonyou, has not issued a patch or responded to disclosure efforts, increasing the urgency for organizations to implement their own mitigations. This vulnerability highlights the risks associated with insufficient input validation and the critical need for secure coding practices in enterprise software.

For European organizations using Yonyou KSOA 9.0, this vulnerability poses a significant risk of unauthorized access to sensitive business data, including financial records, operational details, and personal information. Exploitation could lead to data breaches, loss of data integrity, and disruption of business processes. Given that the attack requires no authentication and can be launched remotely, the attack surface is broad, increasing the likelihood of compromise if exposed to the internet. The lack of vendor response and patch availability exacerbates the risk, forcing organizations to rely on compensating controls. This vulnerability could also impact compliance with European data protection regulations such as GDPR, potentially resulting in legal and financial penalties. Furthermore, organizations in sectors with high reliance on Yonyou products, such as manufacturing, logistics, and finance, may face operational disruptions and reputational damage if exploited.

Since no official patch is available from Yonyou, European organizations should implement immediate mitigations including: 1) Deploy web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the /worksheet/work_update.jsp endpoint and the Report parameter. 2) Conduct thorough input validation and sanitization on all user-supplied data, especially parameters passed to SQL queries, using parameterized queries or prepared statements if source code access is available. 3) Restrict network access to the affected application, limiting exposure to trusted internal networks or VPNs only. 4) Monitor application logs and network traffic for unusual query patterns or injection signatures. 5) Perform regular security assessments and penetration testing focused on injection vulnerabilities. 6) Engage with Yonyou support channels persistently to obtain official patches or guidance. 7) Consider isolating or segmenting the affected systems to minimize lateral movement in case of compromise. 8) Educate development and operations teams on secure coding and input handling best practices to prevent similar vulnerabilities in the future.