CVE-2025-11019 is a cross-site scripting (XSS) vulnerability identified in Total.js CMS versions up to 19.9.0, specifically affecting an unspecified function within the Files Menu component. This vulnerability allows an attacker to inject malicious scripts that execute in the context of the victim's browser. The attack can be initiated remotely without requiring authentication, although user interaction is necessary for the malicious script to execute (e.g., a user clicking a crafted link or visiting a malicious page). The CVSS 4.0 base score is 4.8, indicating a medium severity level. The vector details show that the attack vector is network-based (AV:N), with low attack complexity (AC:L), no privileges required (PR:H indicates high privileges required, but the vector states PR:H which conflicts with the description; given the description states no authentication required, this may be a discrepancy), and user interaction is required (UI:P). The vulnerability impacts confidentiality and integrity to a limited extent (VI:L), with no impact on availability or system components. Although no public exploits are currently known in the wild, the vulnerability has been disclosed publicly, which increases the risk of exploitation. The lack of patches or mitigation links suggests that vendors or maintainers have not yet released an official fix, making it critical for users to implement interim protective measures. XSS vulnerabilities can be leveraged to steal session cookies, perform actions on behalf of authenticated users, or redirect users to malicious sites, potentially leading to further compromise of the affected web application or user data.

For European organizations using Total.js CMS, this vulnerability poses a moderate risk. Exploitation could lead to unauthorized actions performed in the context of legitimate users, potentially exposing sensitive data or enabling phishing attacks. Organizations in sectors such as government, finance, healthcare, and e-commerce, where CMS platforms are used to manage public-facing or internal content, could face reputational damage, regulatory penalties under GDPR if personal data is compromised, and operational disruptions. The remote nature of the attack vector means that attackers do not need physical access or insider privileges, increasing the threat landscape. However, the requirement for user interaction limits automated exploitation, somewhat reducing the immediacy of the threat. Still, targeted spear-phishing or social engineering campaigns could leverage this vulnerability effectively. The absence of known exploits in the wild currently reduces immediate risk but does not eliminate it, especially given the public disclosure.

European organizations should prioritize the following mitigation steps: 1) Immediately audit all Total.js CMS installations to identify affected versions (19.0 through 19.9.0). 2) Apply any available patches or updates from Total.js as soon as they are released. In absence of official patches, implement input validation and output encoding on the Files Menu component to sanitize user inputs and prevent script injection. 3) Employ Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the CMS. 4) Educate users and administrators about the risks of clicking untrusted links and the importance of verifying URLs, to reduce the risk of successful user interaction exploitation. 5) Monitor web server and application logs for unusual or suspicious requests targeting the Files Menu or related endpoints. 6) Consider deploying Content Security Policy (CSP) headers to restrict the execution of unauthorized scripts within the CMS environment. 7) Regularly review and update incident response plans to include scenarios involving XSS exploitation. These steps go beyond generic advice by focusing on specific components and practical controls tailored to this vulnerability.