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RMGCaptcha Math Guard – Math CAPTCHA for Login and WooCommerce

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RMGCaptcha Math Guard – Math CAPTCHA for Login and WooCommerce

by Ridhwan Ahsan

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Description

RMGCaptcha Math Guard adds a GDPR-friendly, math-based CAPTCHA to protect WordPress login, WooCommerce, and Contact Form 7 forms from spam, fake registrations, and brute-force attacks. No external services, no tracking, and fully WordPress.org compliant.

Features:

  • WordPress login protection (captcha on wp-login.php)
  • Contact Form 7 integration via [pmcMathcaptcha] / [pmcMathcaptcha*]
  • WooCommerce login and registration protection
  • Lightweight spam protection without Google reCAPTCHA or third-party tracking
  • Configurable difficulty and operations (Addition/Subtraction/Multiplication/Random)
  • Hide captcha for logged-in users
  • Custom error message support
  • Optional rate limiting and honeypot
  • Failed login log + logged user list (admin pages)
  • Translation-ready
  1. Upload the rmgcaptcha-math-guard folder to the /wp-content/plugins/ directory.
  2. Activate the plugin through the ‘Plugins’ menu in WordPress.
  3. Go to Settings > RMGCaptcha Math Guard to configure.
How do I add it to Contact Form 7?

Use the form tag [pmcMathcaptcha] or [pmcMathcaptcha*] in your CF7 form.

Does it work for logged-in users?

You can hide CAPTCHA for logged-in users via the settings page.

Does it keep logs?

Yes. It provides separate admin pages for Logged User List and Failed Login Log with a clear button for each list.

1.1.2

  • Fix potential security issues and general code cleanup
  • Enhance compatibility with the latest WordPress version
  • Minor UI/UX improvements in admin settings

1.1.1

  • Add automatic version upgrade routine to safely merge settings for existing installs
  • Fix subtraction questions so answers stay user-friendly and validation remains consistent
  • Fix multiplication symbol rendering in generated math questions
  • Add a quick Settings link on the Plugins screen

1.0.1

  • Rename plugin to “RMGCaptcha Math Guard”
  • Add rmgc_ prefix across classes, functions, option and transient keys
  • Update text domain to rmgcaptcha-math-guard
  • Update admin menu titles and slugs
  • Replace translation template with languages/rmgcaptcha-math-guard.pot
  • Update readme metadata and wording
  • Keep existing nonces/CF7 tags for backward compatibility

1.0.0

  • Initial release.
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