CVE-2025-11332 is a cross-site scripting vulnerability identified in CmsEasy, a content management system, affecting versions 7.7.0 through 7.7.7. The vulnerability resides in the URL Handler component, specifically in the lib/inc/view.php file. It stems from improper sanitization or validation of the PHP_SELF server variable, which can be manipulated by an attacker to inject malicious scripts. When a user visits a crafted URL, the injected script executes in the victim's browser context, potentially allowing theft of cookies, session tokens, or other sensitive information, as well as performing actions on behalf of the user. The attack vector is remote and does not require prior authentication, but user interaction (clicking a malicious link) is necessary. The vendor was notified but has not issued a patch or response, and no known exploits have been observed in the wild yet. The CVSS 4.0 vector indicates network attack vector, low attack complexity, no privileges required, partial impact on confidentiality and integrity, and user interaction needed. This vulnerability highlights a common web application security issue where insufficient input validation leads to script injection, posing risks to users and organizations relying on CmsEasy for their web presence.

For European organizations, exploitation of this XSS vulnerability could lead to unauthorized access to user sessions, enabling attackers to impersonate legitimate users, steal sensitive data, or conduct phishing attacks by injecting malicious content into trusted websites. This can damage organizational reputation, lead to data breaches involving personal or financial information, and cause regulatory compliance issues under GDPR. Since CmsEasy is a web-facing CMS, the attack surface is broad, potentially affecting any web application using the vulnerable versions. The medium severity indicates moderate risk, but the lack of vendor response and public exploit availability increases urgency for proactive mitigation. Organizations with high web traffic or handling sensitive user data are particularly vulnerable. Additionally, attackers could leverage this vulnerability as a foothold for further attacks within the network if combined with other vulnerabilities or social engineering tactics.

Given the absence of an official patch, European organizations should implement immediate mitigations such as input validation and output encoding on the PHP_SELF variable within their CmsEasy installations. Web Application Firewalls (WAFs) should be configured to detect and block suspicious requests containing script tags or typical XSS payloads targeting the PHP_SELF parameter. Administrators should restrict user input where possible and monitor web logs for anomalous URL patterns indicative of exploitation attempts. Employ Content Security Policy (CSP) headers to limit the execution of unauthorized scripts in browsers. Organizations should also consider isolating or segmenting vulnerable CmsEasy instances to reduce potential lateral movement. Regular backups and incident response plans should be updated to prepare for potential exploitation. Finally, organizations should track vendor communications for patches or updates and plan for timely upgrades once available.