Fixing 403 Error After Submitting Forms with Easy Form Builder in WordPress

If you’re encountering a 403 error after submitting a form created with Easy Form Builder, you’re not alone. This common issue often relates to caching plugins and AJAX request failures. In this article, we’ll explain the cause of the problem, how to identify it, and how to resolve it to ensure your WordPress forms work flawlessly.

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🛑 What is a 403 Error After Form Submission?

A 403 Forbidden Error occurs when a server refuses to authorize a request. In the context of Easy Form Builder, this error typically appears after form submission, and it means the form request was blocked due to failed authentication or interference during the AJAX process.

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❗ Who Sees This Error?

• Site administrators may encounter this error while testing forms.
• End-users may see the error after submitting a form.

In both cases, the underlying issue is usually related to caching plugins that interfere with dynamic form handling via AJAX.

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🔍 Main Cause: Caching Plugins Blocking AJAX Requests

Easy Form Builder uses AJAX to submit forms without reloading the page. However, some caching plugins may:

• Prevent JavaScript-based AJAX requests from executing correctly
• Serve outdated or static content that doesn’t process the form submission properly
• Block or modify headers required for authentication

This results in failed validation and a 403 error message.

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✅ How to Fix It

Follow these steps to resolve the 403 error:

1. Exclude Form Pages from Caching

• Identify the page(s) where your forms are located (e.g., /contact, /register)
• Go to your caching plugin’s settings
• Add the page URL(s) to the Exclude / Do Not Cache list

Check our full guide here:
🔗 How to Exclude Easy Form Builder Forms from Caching Plugins in WordPress

2. Clear Cache and Retest

• Clear your site’s cache (and CDN cache if applicable)
• Test the form in incognito mode

3. Whitelist AJAX URLs (Advanced)

• Some security or cache plugins allow you to whitelist specific AJAX endpoints.
• Make sure the URL admin-ajax.php is not being blocked or cached.

🧠 Final Notes

The 403 Forbidden error is not a bug in Easy Form Builder. It results from conflicts between your caching/security configuration and dynamic form behavior. By properly excluding form pages and ensuring AJAX is not blocked, you can restore full functionality.