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Vulnerability record · CVE-2026-4373 · published 21 March 2026

CVE-2026-4373: The JetFormBuilder plugin for WordPress is vulnerable to arbitrary file read via path traversal in all version…

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.

7.5 CVSS 3.1 High EPSS 0.57% · top 54.9% CWE-36 · CWE-36 Deferred
7.5CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

LinkTags
https://plugins.trac.wordpress.org/browser/jetformbuilder/tags/3.5.6.2/includes/classes/resources/uploaded-file.php#L99
https://plugins.trac.wordpress.org/browser/jetformbuilder/tags/3.5.6.2/modules/actions-v2/send-email/send-email-action.p
https://plugins.trac.wordpress.org/browser/jetformbuilder/tags/3.5.6.2/modules/block-parsers/file-uploader.php#L313
https://plugins.trac.wordpress.org/changeset/3486996/jetformbuilder
https://www.wordfence.com/threat-intel/vulnerabilities/id/1801fd3e-d56f-4540-9700-9e9de8b465e1?source=cve

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Source: NIST National Vulnerability Database (record CVE-2026-4373), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.