CVE-2026-4373: jetmonsters jetformbuilder — dynamic blocks form builder Absolute Path Traversal

Vulnerability summary

CVE-2026-4373 is a high (CVSS 7.5) Absolute Path Traversal vulnerability in jetmonsters jetformbuilder — dynamic blocks form builder. EPSS estimates a 0.59% chance of exploitation in the next 30 days, higher than 47.6% of scored vulnerabilities. Fixed in 3.5.6.3.

Timeline

1. 21-03-2026
   PublishedVulnerability first disclosed.
2. 08-04-2026
   Last modifiedVulnerability information updated.

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.

• CWE-36Absolute Path TraversalThe product uses external input to construct a pathname that should be within a restricted directory, but it does not properly neutralize absolute path sequences such as "/abs/path" that can resolve to a location that is outside of that directory.