CVE-2022-45280 is a cross-site scripting (XSS) vulnerability identified in the Url parameter of the /login.php page within EyouCMS version 1.6.0. EyouCMS is a content management system used for website management. This vulnerability arises because the application fails to properly sanitize or encode user-supplied input in the Url parameter, allowing an attacker to inject arbitrary web scripts or HTML code. When a victim accesses a crafted URL containing the malicious payload, the injected script executes in the context of the victim's browser. This can lead to session hijacking, credential theft, or unauthorized actions performed on behalf of the user. The CVSS 3.1 base score is 5.4 (medium severity), reflecting that the attack vector is network-based (remote), requires low attack complexity, but needs privileges (PR:L) and user interaction (UI:R). The scope is changed (S:C), indicating that the vulnerability affects resources beyond the initially vulnerable component. The impact on confidentiality and integrity is low, with no impact on availability. No known exploits are reported in the wild, and no official patches or vendor advisories are currently available. The vulnerability is classified under CWE-79, which corresponds to improper neutralization of input during web page generation leading to XSS.

For European organizations using EyouCMS version 1.6.0, this vulnerability poses a risk primarily to web application users and administrators. Successful exploitation could allow attackers to steal session cookies, impersonate users, or conduct phishing attacks by injecting malicious scripts into login pages. This can lead to unauthorized access to sensitive information or administrative functions. Although the impact on system availability is negligible, the compromise of user credentials or session tokens can have cascading effects on data confidentiality and integrity. Organizations in sectors with high reliance on web portals for customer or employee access—such as e-commerce, government services, and education—may face reputational damage and regulatory scrutiny under GDPR if user data is compromised. The requirement for user interaction and some level of privilege reduces the likelihood of widespread automated exploitation but does not eliminate targeted attacks, especially spear-phishing campaigns leveraging this vulnerability.

To mitigate CVE-2022-45280, European organizations should: 1) Immediately review and sanitize all user inputs on the /login.php page, especially the Url parameter, implementing strict input validation and output encoding consistent with OWASP XSS prevention guidelines. 2) Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in browsers. 3) Conduct a thorough code audit of EyouCMS customizations to identify other potential injection points. 4) Monitor web server logs for unusual URL parameters or repeated attempts to inject scripts. 5) Educate users and administrators about the risks of clicking on suspicious links and encourage the use of multi-factor authentication to reduce the impact of credential theft. 6) If possible, upgrade to a patched or newer version of EyouCMS once available or apply community-provided patches. 7) Use web application firewalls (WAFs) configured to detect and block common XSS payloads targeting the Url parameter. These steps go beyond generic advice by focusing on the specific vulnerable parameter and leveraging layered defenses.