Arbitrary File Read Vulnerability in JetFormBuilder Plugin for WordPress
CVE-2026-4373

7.5HIGH

Key Information:

Vendor

WordPress
Status
Jetformbuilder — Dynamic Blocks Form Builder
Vendor
CVE Published:
21 March 2026

What is CVE-2026-4373?

The JetFormBuilder plugin for WordPress is affected by a vulnerability that allows arbitrary file read through path traversal. This issue stems from the 'Uploaded_File::set_from_array' method, which incorrectly accepts user-supplied file paths from the Media Field preset JSON payload without proper validation. An attacker can exploit this flaw by crafting a form request with a Media Field configured to send email attachments, enabling them to exfiltrate sensitive local files. The vulnerability is exacerbated by an inadequate same-file check in 'File_Tools::is_same_file', which only compares basenames, thus enabling unauthenticated attackers to gain access to unauthorized files.

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Deploy the Patch

Affected Version(s)

JetFormBuilder — Dynamic Blocks Form Builder * <= 3.5.6.2

References

https://www.wordfence.com/threat-intel/vulnerabilities/id...
https://plugins.trac.wordpress.org/browser/jetformbuilder...
https://plugins.trac.wordpress.org/browser/jetformbuilder...

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

daroo
JSON
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