CVE-2026-70553
CriticalCVSS 9.8Summary
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation. Attackers can exploit the db_dbprefix value to break out of a PHP string literal and add their own code.
Risk Assessment
Risk of persistent remote code execution with web server process privileges, potentially leading to full system compromise.
Recommendation
Upgrade MaxSite CMS to the latest version. If not available, remove or secure the install endpoint and monitor configuration file integrity.
Original NVD description (English source)
MaxSite CMS contains a remote code execution vulnerability that allows unauthenticated attackers to inject arbitrary PHP code into the application configuration file by submitting crafted POST requests to the install endpoint after installation is complete. Attackers can supply a malicious db_dbprefix value containing a single quote to break out of a PHP string literal in application/config/database.php, appending attacker-controlled PHP statements that are executed by the web server on every subsequent request, resulting in persistent unauthenticated remote code execution as the web-server process user.