CVE-2024-23031 is a Cross Site Scripting (XSS) vulnerability identified in the 'is_water' parameter of eyoucms version 1.6.5. This vulnerability allows a remote attacker to inject and execute arbitrary scripts in the context of a victim's browser by crafting a malicious URL that manipulates the vulnerable parameter. The vulnerability is classified under CWE-79, which pertains to improper neutralization of input during web page generation, leading to XSS attacks. The CVSS 3.1 base score is 6.1, indicating a medium severity level. The vector details (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) reveal that the attack can be launched remotely over the network without privileges and requires user interaction (clicking the crafted URL). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component. The impact affects confidentiality and integrity to a limited extent but does not affect availability. No patches or vendor information are currently provided, and there are no known exploits in the wild at this time. The vulnerability could be leveraged to steal session cookies, perform actions on behalf of users, or deface web content, depending on the victim's privileges and the context of the vulnerable application. Given the lack of vendor and product details, it is assumed that eyoucms is a content management system (CMS) used for website management, which could be targeted to compromise web applications relying on it.

For European organizations, this vulnerability poses a moderate risk primarily to those using eyoucms version 1.6.5 or similar affected versions. Exploitation could lead to unauthorized disclosure of sensitive information such as session tokens or personal data, potentially violating GDPR requirements. Integrity of web content could be compromised, leading to reputational damage and loss of user trust. Since the vulnerability requires user interaction, phishing or social engineering campaigns could be used to lure users into clicking malicious links. This is particularly concerning for organizations with public-facing websites or intranet portals that rely on eyoucms. The vulnerability could also be used as a foothold for further attacks, such as privilege escalation or lateral movement within the network. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers often weaponize such vulnerabilities once disclosed. Organizations handling sensitive customer data, financial transactions, or critical infrastructure information should be especially vigilant.

1. Immediate mitigation involves sanitizing and validating all user inputs, especially the 'is_water' parameter, to neutralize any embedded scripts. 2. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3. Implement HTTP-only and secure flags on cookies to reduce the risk of session hijacking. 4. Educate users and administrators about the risks of clicking unknown or suspicious URLs to reduce successful exploitation via social engineering. 5. Monitor web server logs for unusual URL patterns or repeated attempts to exploit the 'is_water' parameter. 6. If possible, upgrade to a patched version of eyoucms once available or apply vendor-provided patches promptly. 7. Use web application firewalls (WAF) with rules designed to detect and block XSS payloads targeting this parameter. 8. Conduct regular security assessments and penetration testing focusing on input validation and XSS vulnerabilities. 9. Isolate and segment web-facing systems to limit the impact of a successful attack. 10. Maintain an incident response plan tailored to web application attacks to ensure rapid containment and remediation.