MAGMI versions prior to 0.7.24 are vulnerable to a remote authentication bypass due to allowing default credentials in the event there is a database connection failure. A remote attacker can trigger this connection failure if the Mysql setting max_connections (default 151) is lower than Apache (or another web server) setting MaxRequestWorkers (formerly MaxClients) (default 256). This can be done by sending at least 151 simultaneous requests to the Magento website to trigger a "Too many connections" error, then use default magmi:magmi basic authentication to remotely bypass authentication.

Currently, all versions of MAGMI are vulnerable to CSRF due to the lack of CSRF tokens. RCE (via phpcli command) is possible in the event that a CSRF is leveraged against an existing admin session for MAGMI.

A Cross-Site Scripting (XSS) was discovered in 'Magmi 0.7.22'. The vulnerability exists due to insufficient filtration of user-supplied data (prefix) passed to the 'magmi-git-master/magmi/web/ajax_gettime.php' URL. An attacker could execute arbitrary HTML and script code in a browser in the context of the vulnerable website.

Multiple cross-site scripting (XSS) vulnerabilities in the MAGMI (aka Magento Mass Importer) plugin for Magento Server allow remote attackers to inject arbitrary web script or HTML via the (1) profile parameter to web/magmi.php or (2) QUERY_STRING to web/magmi_import_run.php.

Directory traversal vulnerability in web/ajax_pluginconf.php in the MAGMI (aka Magento Mass Importer) plugin for Magento Server allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter.

Unrestricted file upload vulnerability in magmi/web/magmi.php in the MAGMI (aka Magento Mass Importer) plugin 0.7.17a and earlier for Magento Community Edition (CE) allows remote authenticated users to execute arbitrary code by uploading a ZIP file that contains a PHP file, then accessing the PHP file via a direct request to it in magmi/plugins/.