For our nineteenth security review of a WordPress plugin based on the voting of our customers, we reviewed the plugin Regenerate Thumbnails.

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The review was done on version 3.0.2 of Regenerate Thumbnails. We checked for the following issues during this review:

• Insecure file upload handling (this is the cause of the most exploited type of vulnerability, arbitrary file upload)
• Deserialization of untrusted data
• Security issues with functions accessible through WordPress’ AJAX functionality (those are a common source of disclosed vulnerabilities these days)
• Persistent cross-site scripting (XSS) vulnerabilities in publicly accessible portions of the plugin
• Cross-site request forgery (CSRF) vulnerabilities in the admin portion of the plugin
• SQL injection vulnerabilities (the code that handles requests to the database)
• Reflected cross-site scripting (XSS) vulnerabilities
• Security issues with functions accessible through any of the plugin’s shortcodes
• Security issues with functions accessible through the admin_action action
• Security issues with functions accessible through the admin_init action
• Security issues with import/export functionality
• Security issues with usage of is_admin()
• Host header injection vulnerabilities
• Lack of protection against unintended direct access of PHP files
• Insecure and unwarranted requests to third-party websites
• Any additional possible issues identified by our Plugin Security Checker

Results

We found one really minor issue.

Lack of Protection Against Direct Access to PHP Files

Two .php files in the plugin are not intended to be directly accessed but do not contain protection against direct access. The files only define classes, so there is nothing exploitable if they are accessed and adding a restriction has limited value.

Plugin Security Scorecard Grade for Regenerate Thumbnails

See issues causing the plugin to get less than A+ grade