Simple CAPTCHA with Cloudflare Turnstile < 1.42.0 - Unauthenticated Turnstile Protection Bypass via Reusable Forminator Cache Key (CVE-2026-15239) | HOL Guard CVE

Medium · CVSS 5.3CVE-2026-15239

Simple CAPTCHA with Cloudflare Turnstile < 1.42.0 - Unauthenticated Turnstile Protection Bypass via Reusable Forminator Cache Key

Answer in brief

CVE-2026-15239 records a Medium severity (CVSS 5.3) vulnerability in Simple CAPTCHA with Cloudflare Turnstile < 1.42.0 - Unauthenticated Turnstile Protection Bypass via Reusable Forminator Cache Key. The current sources do not mark it as known exploited. The current feed maps Unknown/Simple CAPTCHA with Cloudflare Turnstile (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 7, 2026Updated Aug 26, 2026Source checked Sep 21, 2026First seen by HOL Aug 7, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.3
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Simple CAPTCHA with Cloudflare Turnstile (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Simple CAPTCHA with Cloudflare Turnstilegeneric	>=0 <1.42.0	1.42.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Simple CAPTCHA with Cloudflare Turnstile.
Review the reported fix. Update Unknown/Simple CAPTCHA with Cloudflare Turnstile to 1.42.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 7, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 7, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.