CVE-2026-1133 identifies a SQL injection vulnerability in Yonyou KSOA 9.0, a business software platform widely used for enterprise resource planning and office automation. The vulnerability resides in the HTTP GET parameter handler of the /kmf/folder.jsp file, where the folderid parameter is improperly sanitized, allowing an attacker to inject malicious SQL code. This injection can be exploited remotely without authentication or user interaction, enabling attackers to manipulate backend database queries. Potential consequences include unauthorized data access, data modification, or disruption of service. The CVSS 4.0 base score is 6.9 (medium), reflecting the ease of exploitation and limited impact scope. The vendor was notified early but has not issued any patches or advisories, leaving systems exposed. No known active exploitation has been reported yet, but the public disclosure and availability of exploit details increase the likelihood of future attacks. The vulnerability affects only version 9.0 of KSOA, so organizations running other versions may not be impacted. Given the critical role of KSOA in managing enterprise data, exploitation could lead to significant business disruptions or data breaches if leveraged by attackers.

For European organizations, this vulnerability poses a moderate risk primarily to confidentiality and integrity of enterprise data managed by Yonyou KSOA 9.0. Attackers could extract sensitive business information or alter records, potentially impacting financial operations, compliance, and decision-making processes. Availability impact is limited but possible if attackers execute disruptive SQL commands. The lack of vendor response and patches increases exposure time, raising the risk of exploitation especially in sectors with high reliance on Yonyou products such as manufacturing, finance, and government agencies. Data privacy regulations like GDPR heighten the consequences of data breaches resulting from this vulnerability. Organizations with remote-facing KSOA instances are particularly vulnerable to automated scanning and exploitation attempts. The medium severity rating suggests that while the vulnerability is serious, it is not critical, but still requires timely attention to prevent escalation.

Since no official patches are available, European organizations should implement immediate compensating controls. These include deploying web application firewalls (WAFs) with custom rules to detect and block SQL injection attempts targeting the folderid parameter in /kmf/folder.jsp. Conduct thorough input validation and sanitization on all user-supplied parameters within KSOA if possible. Restrict network access to the KSOA web interface to trusted IP ranges and enforce strong authentication and authorization controls to reduce exposure. Monitor logs for suspicious query patterns or repeated access attempts to the vulnerable endpoint. Consider isolating the affected application in a segmented network zone to limit lateral movement. Engage with Yonyou support channels for updates and plan for an upgrade or patch deployment once available. Regularly back up critical data to enable recovery in case of compromise. Finally, conduct security awareness training for IT staff to recognize and respond to exploitation attempts.