CVE-2025-12290 identifies a cross-site scripting (XSS) vulnerability in the Suishang Enterprise-Level B2B2C Multi-User Mall System version 1.0, specifically within an unspecified functionality tied to the /i/359 endpoint. The vulnerability stems from improper handling of the 'keywords' argument, which allows an attacker to inject malicious JavaScript code that executes in the context of users visiting the affected page. This flaw can be exploited remotely without any authentication, requiring only that a victim interacts with a crafted URL or input. The vulnerability impacts the confidentiality and integrity of user sessions by enabling theft of cookies, session tokens, or other sensitive information, and can facilitate further attacks such as phishing or malware delivery. The vendor was notified but has not issued a patch or response, and while no active exploitation has been reported, the public disclosure increases the risk of exploitation attempts. The CVSS 4.0 score of 5.3 reflects medium severity, considering the attack vector is network-based, no privileges or authentication are required, but user interaction is necessary. The vulnerability does not affect system availability or require complex conditions, making it a moderate risk for organizations relying on this e-commerce platform. The lack of vendor response and patch availability necessitates proactive mitigation by affected parties.

For European organizations using the Suishang Enterprise-Level B2B2C Multi-User Mall System, this XSS vulnerability poses risks primarily to the confidentiality and integrity of customer data and user sessions. Attackers could hijack user accounts, steal sensitive information such as payment details or personal data, and perform unauthorized actions within the application. This can lead to financial losses, regulatory non-compliance (e.g., GDPR violations), and reputational damage. The vulnerability could also be leveraged to distribute malware or conduct phishing campaigns targeting customers. Given the e-commerce context, trust in the platform is critical, and exploitation could undermine customer confidence. The lack of vendor patching increases exposure duration, requiring organizations to implement compensating controls. While the vulnerability does not directly impact system availability, the indirect effects of compromised user accounts and data breaches can disrupt business operations and customer relations. European organizations with significant online retail presence or handling sensitive customer data are particularly at risk.

To mitigate CVE-2025-12290, affected organizations should implement the following specific measures: 1) Apply strict input validation and sanitization on the 'keywords' parameter and any user-supplied input to ensure that scripts or HTML cannot be injected. 2) Employ context-aware output encoding (e.g., HTML entity encoding) before rendering user input in web pages to prevent script execution. 3) Deploy and properly configure a Web Application Firewall (WAF) with rules to detect and block common XSS attack patterns targeting the affected endpoint. 4) Conduct thorough code reviews and security testing of the affected application components to identify and remediate similar vulnerabilities. 5) Educate users and administrators about the risks of clicking untrusted links and monitor logs for suspicious activity indicative of attempted exploitation. 6) If possible, isolate or restrict access to the vulnerable endpoint until a vendor patch or update is available. 7) Engage with the vendor or consider migrating to alternative, actively maintained e-commerce platforms with better security support. 8) Implement Content Security Policy (CSP) headers to reduce the impact of potential XSS attacks by restricting script sources.