JetFormBuilder <= 3.5.6.2 - Unauthenticated Arbitrary File Read via Media Field

2026-03-20 18:28

daroo

Strategic Overview

Status

Patched in 3.5.6.3

Affected PluginJetFormBuilder — Dynamic Blocks Form Builder

Affected Version<= 3.5.6.2

CVSS7.5High

CVECVE-2026-4373

View all JetFormBuilder — Dynamic Blocks Form Builder vulnerabilities

Vulnerability Overview

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.

Technical Analysis

REMEDIATION: Update to version 3.5.6.3, or a newer patched version --- IDENTIFIER: CWE-36 (Absolute Path Traversal) The 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.

External References

https://www.cve.org/CVERecord?id=CVE-2026-4373 https://www.wordfence.com/threat-intel/vulnerabilities/id/1801fd3e-d56f-4540-9700-9e9de8b465e1

CVSS Vector

7.5

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

Base

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone

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