CVE-2025-15416 is a cross-site scripting vulnerability identified in the xnx3 wangmarket e-commerce platform, affecting versions 6.0 through 6.4. The vulnerability resides in the /siteVar/save.do endpoint, specifically within the Add Global Variable Handler component. An attacker can manipulate the Remark or Variable Value parameters to inject malicious scripts due to insufficient input sanitization. This flaw allows remote exploitation without the need for authentication bypass but requires the attacker to have high privileges and user interaction to trigger the payload. The vulnerability impacts the confidentiality and integrity of user sessions and data by enabling script execution in the context of the victim’s browser. Despite early vendor notification, no patch or remediation has been released, and a public exploit is available, increasing the risk of exploitation. The CVSS 4.8 score reflects a medium severity, considering the ease of exploitation and potential impact. The vulnerability does not affect availability and does not require scope changes. The lack of vendor response and public exploit dissemination necessitate immediate attention from users of the affected versions.

For European organizations, this vulnerability poses a moderate risk primarily to the confidentiality and integrity of web applications running xnx3 wangmarket. Successful exploitation could lead to session hijacking, unauthorized actions performed on behalf of legitimate users, and potential data leakage. Organizations handling sensitive customer data or financial transactions through this platform could face reputational damage and regulatory scrutiny under GDPR if user data is compromised. The requirement for high privileges and user interaction somewhat limits the attack surface but does not eliminate risk, especially in environments with multiple administrators or users with elevated rights. The absence of a vendor patch increases exposure time, making timely mitigation critical. Attackers could leverage this vulnerability to conduct targeted attacks against European e-commerce businesses, potentially disrupting operations and eroding customer trust.

1. Implement strict input validation and output encoding on the Remark and Variable Value parameters to prevent script injection. 2. Restrict access to the /siteVar/save.do endpoint to trusted administrators only, using network segmentation or access control lists. 3. Employ web application firewalls (WAFs) with custom rules to detect and block malicious payloads targeting this endpoint. 4. Monitor logs for unusual activity related to the Add Global Variable Handler component and the vulnerable parameters. 5. If feasible, disable the Add Global Variable Handler functionality temporarily until a vendor patch is available. 6. Educate privileged users about the risks of interacting with untrusted input and the importance of cautious behavior to avoid triggering XSS payloads. 7. Regularly review and update security policies to include this vulnerability and ensure rapid response to any exploitation attempts. 8. Engage with the vendor or community for updates or unofficial patches and consider alternative platforms if the vendor remains unresponsive.