CVE-2024-23034 is a Cross Site Scripting (XSS) vulnerability identified in eyoucms version 1.6.5. This vulnerability arises from insufficient input validation or sanitization of a particular input parameter that can be manipulated via a crafted URL. An attacker can exploit this flaw by crafting a malicious URL containing executable script code, which when processed by the vulnerable eyoucms instance, results in the execution of arbitrary code within the context of the victim's browser session. This type of vulnerability falls under CWE-79, which is a common web application security weakness. The CVSS v3.1 base score is 6.1, indicating a medium severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N) shows that the attack can be launched remotely over the network without any privileges or authentication required, but it does require user interaction (the victim must click or visit the malicious URL). The scope is changed (S:C), meaning the vulnerability affects resources beyond the initially vulnerable component, and the impact affects confidentiality and integrity to a limited extent, but not availability. No known exploits in the wild have been reported yet, and no official patches or vendor information is currently available. The vulnerability specifically targets eyoucms, a content management system, but the exact affected product details beyond version 1.6.5 are not provided.

For European organizations using eyoucms version 1.6.5, this vulnerability poses a risk of client-side code injection leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. This can compromise the confidentiality and integrity of user data and potentially lead to further exploitation such as phishing or spreading malware. Since eyoucms is a CMS, it may be used by small to medium enterprises or niche websites, including those handling sensitive customer or internal data. The impact is particularly relevant for organizations with public-facing web portals or intranet sites accessible to European users. The requirement for user interaction means social engineering or phishing campaigns could be used to lure victims to the malicious URL. Although availability is not impacted, the breach of confidentiality and integrity can damage organizational reputation, lead to regulatory non-compliance (e.g., GDPR), and cause financial losses. The lack of a patch increases the urgency for mitigation. Since no known exploits are in the wild, proactive measures can reduce risk before exploitation becomes widespread.

European organizations should immediately audit their web infrastructure to identify any deployments of eyoucms version 1.6.5. If found, they should consider the following specific actions: 1) Implement strict input validation and output encoding on all user-supplied data, especially URL parameters, to neutralize malicious scripts. 2) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3) Use web application firewalls (WAFs) configured to detect and block common XSS attack patterns targeting eyoucms. 4) Educate users and staff about the risks of clicking on suspicious links and implement phishing awareness training. 5) Monitor web server logs for unusual URL access patterns indicative of attempted exploitation. 6) If possible, isolate or restrict access to vulnerable eyoucms instances until a vendor patch or update is available. 7) Regularly check for vendor advisories or community patches addressing this vulnerability. These measures go beyond generic advice by focusing on detection, user awareness, and layered defenses tailored to the specific CMS and vulnerability type.