Arbitrary Code Execution Vulnerability in Formidable Forms Plugin for WordPress
CVE-2026-19857

4.8MEDIUM

Key Information:

Vendor

WordPress
Status
Formidable Forms
Vendor
CVE Published:
16 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19857?

The Formidable Forms WordPress plugin, prior to version 6.35, is susceptible to a security vulnerability that allows unauthenticated users to manipulate a request-derived value. This flaw enables malicious visitors to execute arbitrary shortcodes with attacker-defined attributes. When these shortcodes are rendered on any page containing the affected form, it results in unwanted scripts being processed server-side. This may lead to various forms of web exploitation and adversely affect the website's integrity.

Affected Version(s)

Formidable Forms 6.34 < 6.35

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-2026-19857 - Proof of Concept

References

https://wpscan.com/vulnerability/5ff439f4-aa99-4198-b908-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jakub Herman
WPScan
.