JetFormBuilder — Dynamic Blocks Form Builder, CVE-2026-4373

CVE, Research URL: CVE-2026-4373
Home page URL: Security reports for JetFormBuilder — Dynamic Blocks Form Builder
Application: JetFormBuilder — Dynamic Blocks Form Builder
Published on: Mar 21, 2026
Research Description: The JetFormBuilder plugin for WordPress is vulnerable to arbitrary file read via path traversal in all versions up to, and including, 3.5.6.2. This is due to the 'Uploaded_File::set_from_array' method accepting user-supplied file paths from the Media Field preset JSON payload without validating that the path belongs to the WordPress uploads directory. Combined with an insufficient same-file check in 'File_Tools::is_same_file' that only compares basenames, this makes it possible for unauthenticated attackers to exfiltrate arbitrary local files as email attachments by submitting a crafted form request when the form is configured with a Media Field and a Send Email action with file attachment.
Affected versions: max 3.5.6.3.
Status: vulnerable