CVE-2025-15203 is a cross-site scripting (XSS) vulnerability identified in SohuTV CacheCloud versions 3.0, 3.1, and 3.2.0. The flaw resides in the index function of the ResourceController.java file, where insufficient input sanitization allows attackers to inject malicious JavaScript code. This vulnerability can be exploited remotely without authentication, but requires user interaction to trigger the malicious script execution in a victim's browser. The vulnerability could be exploited by crafting a specially manipulated request that, when processed by the vulnerable function, reflects attacker-controlled input in the web response without proper encoding or sanitization. This leads to execution of arbitrary scripts in the context of the affected web application, potentially enabling session hijacking, credential theft, or other malicious actions. The CVSS 4.8 score reflects a medium severity, considering the network attack vector, lack of required privileges, and user interaction needed. Although the vendor was informed early, no patch or fix has been released, and exploit code has been made publicly available, increasing the risk of exploitation. The vulnerability does not affect confidentiality or availability directly but impacts integrity and user trust. CacheCloud is a cloud caching solution used to improve application performance by caching data, and its compromise could lead to indirect impacts on application security and user data privacy.

For European organizations, exploitation of this XSS vulnerability could lead to compromised user sessions, theft of sensitive information, and potential unauthorized actions performed on behalf of users. Organizations relying on SohuTV CacheCloud for caching services in web applications may see their users targeted by phishing or drive-by attacks exploiting this vulnerability. The impact is particularly significant for sectors handling sensitive data such as finance, healthcare, and government services. Additionally, reputational damage and regulatory consequences under GDPR could arise if personal data is exposed or misused. Since the vulnerability requires user interaction, social engineering campaigns could be used to increase exploitation success. The lack of a vendor patch increases exposure time, making proactive mitigation essential. The vulnerability does not directly affect system availability but can degrade trust and integrity of web applications relying on CacheCloud.

European organizations should implement strict input validation and output encoding on all user-supplied data processed by CacheCloud interfaces, especially the affected ResourceController index function. Employ web application firewalls (WAFs) with updated signatures to detect and block XSS attack patterns targeting CacheCloud. Monitor web server logs and application behavior for unusual requests or error patterns indicative of exploitation attempts. Educate users about the risks of clicking suspicious links or interacting with untrusted content to reduce successful user interaction exploitation. If possible, isolate CacheCloud instances behind secure network segments and restrict access to trusted users. Engage with the vendor or community to track patch releases and apply updates promptly once available. Consider deploying Content Security Policy (CSP) headers to limit the impact of injected scripts. Finally, conduct regular security assessments and penetration testing focused on web application vulnerabilities including XSS.