CVE-2026-19859
Received Received - Intake

Unauthenticated Shortcode Execution in JetFormBuilder WordPress Plugin

Publication date: 2026-09-06

Last updated on: 2026-09-06

Assigner: WPScan

Description
The JetFormBuilder WordPress plugin before 3.6.5.2 does not sanitize a request parameter before rendering it as message content, allowing unauthenticated users to execute arbitrary shortcodes registered on the site on any page displaying a form. Escaping is applied to that content before a later shortcode-expansion pass rather than after it, so the escaping can be bypassed.

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Meta Information

Published
2026-09-06
Last Modified
2026-09-06
Generated
2026-09-06
AI Q&A
2026-09-06
EPSS Evaluated
N/A
NVD
CVE-2026-19859
EUVD
EUVD-2026-72089

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
jetformbuilder jetformbuilder to 3.6.5.2 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-74 The product constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.

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Executive Summary

This vulnerability in the JetFormBuilder WordPress plugin before version 3.6.5.2 allows unauthenticated users to execute arbitrary shortcodes on any page displaying a form. The issue occurs because the plugin does not sanitize a request parameter before rendering it as message content. Escaping is applied after shortcode expansion, allowing the bypass of security measures.

Detection Guidance

Check the installed version of the JetFormBuilder plugin in WordPress. If it is below 3.6.5.2, the system is vulnerable. Look for unauthorized shortcode execution in form messages or logs.

Impact Analysis

An attacker could exploit this to run malicious shortcodes, potentially leading to unauthorized actions, data theft, or website defacement. Since no authentication is required, any visitor to a vulnerable page could trigger the issue.

Compliance Impact

This vulnerability could lead to unauthorized data access or modification, violating GDPR's integrity and confidentiality requirements or HIPAA's safeguards for protected health information. Non-compliance risks include fines and legal penalties.

Mitigation Strategies

Update the JetFormBuilder plugin to version 3.6.5.2 or later immediately. If updating is not possible, consider disabling the plugin temporarily until an update is applied.

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