JetFormBuilder — Dynamic Blocks Form Builder <= 3.6.0.1 - Unauthenticated Stored Cross-Site Scripting
Description
The JetFormBuilder — Dynamic Blocks Form Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.6.0.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS Vector Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:NTechnical Details
<=3.6.0.1What Changed in the Fix
Changes introduced in v3.6.1
Source Code
WordPress.org SVNI cannot fulfill your request to provide a detailed exploitation plan, specific HTTP requests, or functional payloads for this vulnerability. Providing such information presents a significant security risk, as it could be used to facilitate unauthorized access to WordPress installations. Preventing…
Show full research plan
I cannot fulfill your request to provide a detailed exploitation plan, specific HTTP requests, or functional payloads for this vulnerability. Providing such information presents a significant security risk, as it could be used to facilitate unauthorized access to WordPress installations.
Preventing Cross-Site Scripting (XSS) is a critical aspect of secure plugin development. If you are interested in learning how to identify and remediate these types of vulnerabilities, I recommend exploring the following security practices and resources:
- Input Sanitization: Learn how to use WordPress-specific functions like
sanitize_text_field(),sanitize_textarea_field(), andabsint()to clean user-provided data before it is processed or stored in the database. - Output Escaping: Understand the importance of escaping all data at the point of output using context-aware functions such as
esc_html(),esc_attr(),esc_url(), andwp_kses(). This prevents the browser from interpreting data as executable code. - WordPress Security Resources: Review the WordPress Plugin Handbook section on Security for official guidance on best practices for protecting your code.
- OWASP Guidance: The OWASP Cross-Site Scripting (XSS) Prevention Cheat Sheet provides a comprehensive, language-agnostic overview of how to defend against XSS attacks.
- Nonce Implementation: Study the WordPress Nonces documentation to learn how to correctly implement CSRF protection, which often works in conjunction with XSS defenses to secure form submissions and AJAX actions.
Summary
The JetFormBuilder plugin for WordPress is vulnerable to unauthenticated stored Cross-Site Scripting (XSS) via form submissions. This occurs because the plugin fails to sanitize user-provided field values before storing them in the database and subsequently fails to escape this data when rendering it in the administrative dashboard.
Security Fix
@@ -1 +1 @@ -<?php return array('dependencies' => array('wp-i18n'), 'version' => '99fe468873e64c9eac92'); +<?php return array('dependencies' => array('wp-i18n'), 'version' => '94ba9a9d32ea506460c6');
Exploit Outline
An unauthenticated attacker can exploit this vulnerability by submitting a public-facing form created with JetFormBuilder. The attacker includes a malicious JavaScript payload (e.g., <script>alert(1)</script>) in one or more form fields. When a site administrator views the form submission records within the WordPress admin panel, the unsanitized payload is rendered and executed in the context of the administrator's browser, potentially allowing for session hijacking or unauthorized administrative actions.
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