CVE-2026-15239: Unknown Simple Captcha With Cloudflare Turnstile

Medium severity, CVSS 5.3. EPSS: 0.2% chance of exploitation in the next 30 days.

The Simple CAPTCHA with Cloudflare Turnstile WordPress plugin before 1.42.0 does not bind its Turnstile validation cache to the single-use challenge token in its Forminator integration, instead keying it to an attacker-controlled, reusable request value, allowing unauthenticated attackers to solve one challenge and then replay token-less form submissions for a short window, defeating the anti-abuse protection the plugin provides.

Affected products

• Unknown Simple Captcha With Cloudflare Turnstile: before 1.42.0 (fixed in 1.42.0)

Published 2026-08-07. Last modified 2026-08-26.