CVE-2025-11306 is a cross-site scripting (XSS) vulnerability identified in qianfox FoxCMS versions up to 1.2, specifically affecting the Search Page component located at /index.php/Search. The vulnerability arises from improper sanitization or validation of the 'keyword' parameter, which an attacker can manipulate to inject malicious scripts. This flaw allows remote attackers to execute arbitrary JavaScript code in the context of the victim's browser when they visit a crafted URL or interact with the vulnerable search functionality. The vulnerability does not require any authentication or privileges and can be exploited without user interaction, aside from the victim visiting the malicious link. The vendor was notified early but has not responded or issued a patch, and while no known exploits are currently observed in the wild, proof-of-concept exploits have been publicly disclosed. The CVSS 4.0 base score is 5.3 (medium severity), reflecting the network attack vector, low complexity, no privileges required, and user interaction needed. The impact primarily affects confidentiality and integrity by enabling theft of session cookies, credentials, or performing actions on behalf of the user via script execution. Availability is not directly impacted. The vulnerability is limited to FoxCMS, a content management system, which may be used by small to medium websites for content publishing and management.

For European organizations using FoxCMS, this vulnerability poses a moderate risk. Exploitation could lead to session hijacking, credential theft, or defacement of websites, undermining user trust and potentially exposing sensitive user data. Organizations in sectors with high web presence such as e-commerce, media, education, or local government could face reputational damage and regulatory scrutiny under GDPR if personal data is compromised. Since the vulnerability allows remote exploitation without authentication, attackers can target publicly accessible websites indiscriminately. The lack of vendor response and patches increases the window of exposure, potentially inviting opportunistic attackers to exploit the flaw. However, the medium CVSS score and requirement for user interaction (victim clicking a malicious link) somewhat limit the threat severity. Still, phishing campaigns or social engineering could amplify the impact. The vulnerability does not directly affect availability or system integrity beyond the scope of the web application, but the indirect consequences on business operations and compliance could be significant.

European organizations should immediately audit their web infrastructure to identify any instances of FoxCMS versions 1.0 through 1.2. If FoxCMS is in use, they should consider the following specific mitigations: 1) Implement Web Application Firewall (WAF) rules to detect and block malicious payloads targeting the 'keyword' parameter in the Search Page. 2) Apply input validation and output encoding at the application level, if possible, by customizing or patching the CMS code to sanitize the 'keyword' parameter before rendering. 3) Restrict or disable the vulnerable search functionality temporarily if feasible. 4) Educate users and administrators about phishing risks related to XSS attacks to reduce successful exploitation via social engineering. 5) Monitor web server logs for suspicious requests targeting the search endpoint. 6) Consider migrating to alternative CMS platforms with active security maintenance if vendor support remains absent. 7) Employ Content Security Policy (CSP) headers to limit the impact of injected scripts. These measures go beyond generic advice by focusing on compensating controls and proactive detection in the absence of an official patch.