Vulnerability in Simple Captcha With Cloudflare Turnstile

CVE-2026-15239

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

EPSS: 0.002 (5.0th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 5.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-15239: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • Simple Captcha With Cloudflare Turnstile — versions 0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-15239?
CVE-2026-15239 is a medium-severity vulnerability in Simple Captcha With Cloudflare Turnstile, classified under Insufficient Verification of Data Authenticity. CVSS score: 5.3/10. Published 2026-08-07.
How severe is CVE-2026-15239?
Medium severity. CVSS v3 base score is 5.3 out of 10.