CVE-2022-40000 is a Cross Site Scripting (XSS) vulnerability identified in FeehiCMS version 2.1.1. This vulnerability arises from improper sanitization of user input in the username field on the admin login page. An attacker can exploit this flaw by injecting malicious scripts into the username field, which are then executed in the context of the victim's browser session. The vulnerability is classified under CWE-79, indicating it is a classic reflected or stored XSS issue. The CVSS 3.1 base score is 5.4 (medium severity), with the vector indicating network attack vector (AV:N), low attack complexity (AC:L), requiring privileges (PR:L), user interaction (UI:R), scope changed (S:C), and low impact on confidentiality and integrity (C:L/I:L) but no impact on availability (A:N). The scope change means that the vulnerability affects components beyond the initially vulnerable component, potentially allowing privilege escalation or broader impact within the system. Although no known exploits are reported in the wild, the vulnerability allows remote attackers with some level of privileges to execute arbitrary code in the context of the admin user’s browser session, potentially leading to session hijacking, credential theft, or further exploitation of the CMS backend. FeehiCMS is a content management system primarily used in certain web hosting environments, and the vulnerability specifically targets the administrative login interface, making it a critical point of concern for administrators and organizations relying on this CMS for website management. The lack of vendor or product details beyond the CMS name and version limits the granularity of the analysis but does not diminish the risk posed by this vulnerability in affected deployments.

For European organizations using FeehiCMS 2.1.1, this vulnerability poses a moderate risk primarily to the confidentiality and integrity of administrative sessions. Successful exploitation could allow attackers to execute arbitrary scripts in the context of admin users, potentially leading to credential theft, session hijacking, or unauthorized administrative actions. This could result in defacement, data leakage, or further compromise of internal systems managed via the CMS. Given that the vulnerability requires some level of privileges and user interaction, the risk is somewhat mitigated but remains significant in environments where administrative users may be targeted via phishing or social engineering. The impact on availability is negligible, but the potential for lateral movement or privilege escalation within the CMS environment could have broader operational consequences. European organizations with public-facing websites managed by FeehiCMS, especially those in sectors with sensitive data or regulatory requirements (e.g., finance, healthcare, government), could face reputational damage and compliance issues if exploited.

1. Immediate patching or upgrading to a version of FeehiCMS that addresses this XSS vulnerability is the most effective mitigation. If no patch is available, consider disabling or restricting access to the admin login page until a fix is applied. 2. Implement strict input validation and output encoding on all user-supplied data, especially on the admin login page username field, to prevent script injection. 3. Employ Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts in the browser context, mitigating the impact of XSS attacks. 4. Enforce multi-factor authentication (MFA) for administrative accounts to reduce the risk of account compromise even if session hijacking occurs. 5. Monitor web server and application logs for unusual activity around the admin login page, including repeated failed login attempts or suspicious input patterns. 6. Conduct security awareness training for administrators to recognize and avoid phishing attempts that could facilitate exploitation requiring user interaction. 7. Use web application firewalls (WAFs) with rules tailored to detect and block XSS payloads targeting the login interface. 8. Limit administrative access by IP whitelisting or VPN-only access to reduce exposure of the vulnerable interface to the internet.