The Formidable Form Builder for WordPress is a popular plugin used by website owners to create versatile forms. It is utilized by a wide range of users including bloggers, businesses, and developers to easily manage contact forms, surveys, and other interactive elements in WordPress sites. The plugin is designed to integrate seamlessly with WordPress, providing a user-friendly interface for form creation. It helps users gather information efficiently and allows for customization to cater to specific needs. Being open-source, it is widely adopted and valued for its flexibility and extensibility in the WordPress ecosystem. Formidable Forms also supports various add-ons, which enhance its functionality and meet diverse user needs.
The cross-site scripting vulnerability in Formidable Form Builder affects versions prior to 2.05.03. This type of vulnerability arises when user-input is improperly sanitized, allowing attackers to inject malicious scripts. Unauthenticated attackers can exploit this vulnerability through certain form parameters like 'after_html'. The vulnerability lets attackers execute arbitrary code in users' browsers. Exploiting this vulnerability could result in unauthorized actions performed in the context of the user's session, including data theft and manipulation. It may escalate into more serious attacks like session hijacking, depending on how the exploit is utilized.
The vulnerability manifests due to insufficient input sanitization and output escaping in the after_html' form parameter. Attackers inject scripts by manipulating the POST request to the formidable' plugin's AJAX endpoint. This potentially allows the execution of JavaScript when a site admin or user interacts with a malicious entry. The attack vector involves sending crafted payloads via form inputs. Successful execution typically requires user interaction to trigger the malicious script. Monitoring and ensuring robust input validation can mitigate against such an exploit.
If successfully exploited, this vulnerability could allow attackers to perform unauthorized actions such as stealing user sessions, defacing websites, or redirecting users to malicious sites. It can lead to the execution of arbitrary scripts within the web application's domain. This exploitation opens routes for further attacks resulting in data leaks, reputational damage, or application manipulation. In more dire scenarios, sensitive user information could be stolen, leading to identity theft or fraud.
REFERENCES
- Immediately update the Formidable Form Builder to version 2.05.03 or later to patch the vulnerability.
- Regularly audit and sanitize all user inputs to ensure they are correctly validated before processing.
- Implement Content Security Policy (CSP) headers to mitigate the execution of malicious scripts.
- Educate users and administrators about the dangers of clicking on untrusted links or performing actions in potentially compromised environments.
- Utilize web application firewalls to detect and block suspicious activities indicative of an XSS attack.
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