Arbitrary Code Execution Vulnerability in JetFormBuilder Plugin for WordPress
CVE-2026-19859

6.5MEDIUM

Key Information:

Vendor

WordPress
Status
Jetformbuilder
Vendor
CVE Published:
6 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19859?

The JetFormBuilder plugin for WordPress versions prior to 3.6.5.2 is susceptible to an arbitrary code execution vulnerability. This issue stems from the failure to properly sanitize a request parameter before it is utilized in rendering message content. Consequently, unauthenticated users may exploit this flaw to execute arbitrary shortcodes registered on the WordPress site across any page that displays a form. The bypass occurs as escaping is performed on the content only prior to a later shortcode expansion rather than at the point of input, allowing for potential security breaches.

Affected Version(s)

JetFormBuilder 0 < 3.6.5.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-19859 - Proof of Concept

References

https://wpscan.com/vulnerability/19c115a5-4280-4b78-a460-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jakub Herman
WPScan
.