Exposure in Simple CAPTCHA Plugin for WordPress by Cloudflare
CVE-2026-15239

5.3MEDIUM

Key Information:

Vendor

WordPress
Status
Simple Captcha With Cloudflare Turnstile
Vendor
CVE Published:
7 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-15239?

The Simple CAPTCHA with Cloudflare Turnstile plugin for WordPress prior to version 1.42.0 is vulnerable to an improper token validation issue. The plugin fails to properly bind its Turnstile validation cache to the unique challenge token in its Forminator integration. This oversight allows attackers to exploit a reusable request value, enabling unauthenticated users to solve a single challenge and subsequently replay token-less submissions for a limited duration. This vulnerability undermines the plugin's intended anti-abuse protection measures, making it critical for site owners to update to the latest version.

Affected Version(s)

Simple CAPTCHA with Cloudflare Turnstile 0 < 1.42.0

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-2026-15239 - Proof of Concept

References

https://wpscan.com/vulnerability/28d3bda2-501c-4eeb-9184-...
exploitvdb-entrytechnical-description

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
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

Meher Sudhakar Abbireddi
WPScan
.