CVE-2025-64048 is a stored cross-site scripting (XSS) vulnerability affecting YCCMS version 3.4, a content management system. The vulnerability is located in the article management module, specifically within the add() and getPost() functions in the ArticleAction.class.php file. It stems from improper neutralization of user-supplied input in the article title field, allowing an attacker to inject malicious JavaScript code that is stored persistently on the server. When other users view the affected article, the malicious script executes in their browsers under the context of the vulnerable site, potentially leading to session hijacking, credential theft, or unauthorized actions performed on behalf of the victim. The CVSS 3.1 vector indicates the attack can be performed remotely over the network (AV:N) with low attack complexity (AC:L), requires no privileges (PR:N), but does require user interaction (UI:R). The scope is changed (S:C), meaning the vulnerability can affect resources beyond the initially vulnerable component. The impact affects confidentiality and integrity partially (C:L, I:L) but does not affect availability (A:N). No patches or known exploits are currently available, but the vulnerability is publicly disclosed and should be addressed promptly. The CWE-79 classification confirms it is a classic stored XSS issue caused by insufficient input validation and output encoding.

For European organizations, especially those in media, publishing, or any sector relying on YCCMS 3.4 for content management, this vulnerability poses a risk of client-side script execution leading to data leakage, session hijacking, and unauthorized actions. Attackers could exploit this to steal user credentials, perform phishing attacks, or manipulate content integrity. The partial compromise of confidentiality and integrity can damage organizational reputation and lead to regulatory non-compliance under GDPR if personal data is exposed. Since the vulnerability requires user interaction (viewing malicious content), the impact depends on user exposure to crafted articles. However, the changed scope means attackers might leverage this to escalate attacks beyond the CMS, potentially affecting other integrated systems or user accounts. The absence of known exploits reduces immediate risk but does not eliminate the threat, especially as attackers often develop exploits after public disclosure.

European organizations should immediately audit their use of YCCMS 3.4 and restrict access to article management functionalities. Implement strict input validation and output encoding for all user-supplied data, particularly the article title field, to neutralize malicious scripts. Employ Content Security Policy (CSP) headers to limit script execution sources and reduce XSS impact. Monitor logs for suspicious activity related to article submissions and views. If possible, upgrade to a patched version of YCCMS once available or apply vendor-recommended patches. Educate content managers and users about the risks of clicking on untrusted links or viewing unverified content. Use web application firewalls (WAFs) with rules targeting XSS payloads to provide an additional layer of defense. Regularly review and test the CMS for similar vulnerabilities using automated scanning and manual penetration testing.