CVE-2026-15239 Security feature bypass in Simple CAPTCHA with Cloudflare Turnstile
Unauthenticated attackers can bypass Cloudflare Turnstile protection in the Simple CAPTCHA WordPress plugin by replaying cached validation tokens.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15239?
CVE-2026-15239 is a medium-severity vulnerability in Unknown Simple CAPTCHA with Cloudflare Turnstile, published on 7 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-345
Which versions are affected by CVE-2026-15239?
How do I fix CVE-2026-15239?
No fix has been published for CVE-2026-15239 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-15239 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15239 exists.
Sources
Also known as GHSA-w6f5-3mw7-jjxq.