CmsEasy CVE-2025-11332

No vendor-released patch identified at time of analysis; the vendor did not respond to early disclosure attempts. Immediate remediation options are limited. Recommended compensating controls: (1) Implement output encoding/HTML entity encoding of all server variables including PHP_SELF before rendering in HTML context-use built-in functions such as htmlspecialchars() or htmlentities() with ENT_QUOTES flag; (2) Apply a Web Application Firewall (WAF) rule to detect and block requests with script tags or event handlers in query parameters; (3) Enforce Content Security Policy (CSP) headers with restrictive script-src directive to mitigate XSS payload execution even if injected; (4) Restrict CmsEasy administrative access to trusted IP ranges if the application is internal-facing; (5) Monitor for exploitation attempts in access logs by searching for common XSS payloads (script, onerror, onload, etc.) in URL parameters. Trade-off: WAF rules may block legitimate traffic; CSP may break functionality if application relies on inline scripts. Contact CmsEasy maintainers or consider migrating to actively maintained CMS alternatives if security updates remain unavailable.