WordPress Super Forms is a plugin designed to help users easily create forms with a drag-and-drop interface on their WordPress sites. It is widely used by website developers and administrators to simplify form creation. The plugin is intended for use with websites running the WordPress content management system. Its functionality includes creating contact forms, surveys, and registration forms among others. Due to its extensive feature set, it is popular among both novice and experienced WordPress users. However, users need to be cautious of security vulnerabilities arising in such plugins, which can expose their sites to potential threats.
The vulnerability found in WordPress Super Forms is an Arbitrary File Upload vulnerability. This type of flaw allows attackers to upload malicious files to a server without proper validation of file types. In this case, due to missing file type validation and lack of capability checks in the AJAX handler, unauthenticated attackers can upload executable files to the server. As a result, an attacker can execute these files, possibly commandeering the entire system. Due to its severity, it requires immediate attention and remediation.
Technically, the vulnerability exploits the submit_form nopriv AJAX handler, allowing attackers to upload files without proper authentication or authorization. The endpoint responsible, admin-ajax.php, does not enforce necessary checks, thereby letting files pass through unchecked. The sf_nonce parameter is manipulated to bypass certain security tokens, enabling the uploading of potentially harmful files. Once uploaded, these files can be executed remotely, leading to severe security breaches. Thus, developers must ensure proper validation mechanisms are enforced in sensitive parts of application code.
When exploited, this vulnerability can lead to serious consequences. Attackers could upload scripts or malicious executables to gain control over the server. This control could be leveraged for data theft, website defacement, or injecting other harmful payloads into the system. The impact of such vulnerability could compromise the integrity, confidentiality, and availability of the server and its hosted applications. Therefore, addressing this security hole is critical to maintaining server safety.
REFERENCES
- https://www.wordfence.com/threat-intel/vulnerabilities/id/e9c7fb16-efbb-41e9-be13-98e96c1e9100
- https://patchstack.com/database/wordpress/plugin/super-forms/vulnerability/wordpress-super-forms-drag-drop-form-builder-plugin-6-3-313-unauthenticated-arbitrary-file-upload-vulnerability
- https://github.com/shinthink/CVE-2026-14894
- https://nvd.nist.gov/vuln/detail/CVE-2026-14894
- Update to the latest version of Super Forms - Drag & Drop Form Builder plugin to mitigate any known vulnerabilities.
- Implement file type validation to ensure only permissible file types are uploaded.
- Introduce capability checks in the AJAX handlers to prevent unauthorized upload attempts.
- Regularly audit and test your web applications for security vulnerabilities using updated security tools.
- Educate users and administrators to recognize potential signs of exploitation and react swiftly.
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