CVE-2026-1123 is an SQL injection vulnerability identified in Yonyou KSOA version 9.0, affecting an unspecified function within the /worksheet/work_mod.jsp file. The vulnerability arises from improper sanitization of the HTTP GET parameter 'ID', allowing an attacker to inject malicious SQL code remotely without requiring authentication or user interaction. This flaw enables attackers to manipulate backend database queries, potentially leading to unauthorized data access, data modification, or disruption of service. The CVSS 4.0 base score is 6.9 (medium severity), reflecting the network attack vector, low complexity, no privileges or user interaction needed, and limited impact on confidentiality, integrity, and availability. The vendor has been contacted but has not issued any patches or advisories, and a public exploit is available, increasing the risk of exploitation. The vulnerability is significant because it affects a core module of Yonyou KSOA, a widely used enterprise service-oriented architecture platform, which may be integrated into critical business processes. Attackers exploiting this vulnerability could extract sensitive corporate data, alter records, or cause application downtime, impacting business continuity and compliance with data protection regulations.

For European organizations, exploitation of CVE-2026-1123 could result in unauthorized disclosure of sensitive business information, alteration of critical data, and potential service interruptions. This poses risks to confidentiality, integrity, and availability of enterprise systems relying on Yonyou KSOA 9.0. Organizations in sectors such as finance, manufacturing, and government that use this platform may face operational disruptions and regulatory compliance issues, including GDPR violations if personal data is compromised. The availability of a public exploit increases the likelihood of targeted attacks or opportunistic scanning by threat actors. Additionally, the lack of vendor response and patches complicates remediation efforts, potentially prolonging exposure. The vulnerability could be leveraged as an initial access vector or to escalate privileges within the network, amplifying its impact. European entities with interconnected supply chains or critical infrastructure depending on Yonyou KSOA are particularly vulnerable to cascading effects from exploitation.

Given the absence of official patches, European organizations should implement immediate compensating controls. First, apply strict input validation and sanitization on the 'ID' parameter at the web application or proxy level to block malicious SQL payloads. Deploy and fine-tune Web Application Firewalls (WAFs) to detect and block SQL injection attempts targeting the vulnerable endpoint. Restrict network access to the affected application by limiting exposure to trusted IP addresses and segmenting the network to isolate critical systems. Conduct thorough code reviews and consider temporary disabling or restricting access to the vulnerable functionality if feasible. Monitor logs and network traffic for unusual query patterns or repeated access attempts to /worksheet/work_mod.jsp. Engage in threat hunting to identify potential exploitation attempts. Prepare incident response plans specific to SQL injection attacks and ensure backups are current and tested. Finally, maintain communication with Yonyou for any forthcoming patches or advisories and plan for timely application once available.