What is CVE-2026-4373?

CVE-2026-4373 is a high-severity vulnerability in Jetmonsters Jetformbuilder — Dynamic Blocks Form Builder, classified under Absolute Path Traversal. CVSS score: 7.5/10. Published 2026-03-21.

How severe is CVE-2026-4373?

High severity. CVSS v3 base score is 7.5 out of 10.

Path Traversal in Jetmonsters Jetformbuilder — Dynamic Blocks Form Builder

CVE-2026-4373

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.

EPSS: 0.004 (32.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Jetmonsters Jetformbuilder — Dynamic Blocks Form Builder — versions 0

Weakness classification (CWE)

CWE-36 — Absolute Path Traversal

References

Frequently asked questions

What is CVE-2026-4373?: CVE-2026-4373 is a high-severity vulnerability in Jetmonsters Jetformbuilder — Dynamic Blocks Form Builder, classified under Absolute Path Traversal. CVSS score: 7.5/10. Published 2026-03-21.
How severe is CVE-2026-4373?: High severity. CVSS v3 base score is 7.5 out of 10.