CVE-2026-125055 - Arbitrary File Upload Vulnerability in Chatterbug Forms

Introduction

The CVE-2026-125055 vulnerability affects the Chatterbug Forms plugin for WordPress, allowing unauthenticated attackers to upload arbitrary files. This flaw is critical and can lead to remote code execution.

What happened?

The Chatterbug Forms plugin, used for creating forms in WordPress, has a vulnerability that allows file uploads without proper server-side validation. The cbforms_check_form_submissions function does not correctly validate file extensions, allowing any file type, including PHP files, to be uploaded.

How the vulnerability works

The vulnerability arises from the lack of validation of the file extensions being uploaded. When no restrictions are configured for the upload fields, the system accepts the extension of the uploaded file, which can include potentially dangerous extensions. This allows an attacker to upload executable files, compromising the security of the affected server.

What is the real impact?

The impact of this vulnerability is significant, as it allows unauthenticated attackers to upload malicious files. Once an executable file is uploaded, the attacker can execute code remotely, compromising the integrity and confidentiality of the affected system.

Which versions are affected?

• All versions up to 1.0.2

How to fix

1. Update the Chatterbug Forms plugin to the latest version, which should address this vulnerability.
2. Check for security updates available for WordPress and other installed plugins.
3. Implement a security policy that includes file validation on the server.

Mitigation while you update

While it is not possible to update, it is recommended to deactivate the Chatterbug Forms plugin to avoid any risk of exploitation. Additionally, it is advisable to monitor file uploads and implement firewall rules that block potentially dangerous files.

Conclusion

The CVE-2026-125055 vulnerability in Chatterbug Forms poses a significant risk to WordPress users. It is essential for system administrators and store owners to update the plugin as soon as possible to ensure the security of their sites.