Unauthenticated protection bypass via reusable validation cache
Published Aug 7, 2026 · Updated Aug 7, 2026
Insufficient verification in RelyWP Simple CAPTCHA with Cloudflare Turnstile before 1.42.0 allows remote attackers to bypass form protection. The Forminator check caches successful validation under attacker-controlled form_uid rather than the single-use token and accepts that uncleared entry before extracting a new token. The plugin and Forminator integration must be active on a public form; one solved challenge then permits repeated token-less form entries for five minutes.
Summary
What happened
Insufficient verification in RelyWP Simple CAPTCHA with Cloudflare Turnstile before 1.42.0 allows remote attackers to bypass form protection. The Forminator check caches successful validation under attacker-controlled form_uid rather than the single-use token and accepts that uncleared entry before extracting a new token. The plugin and Forminator integration must be active on a public form; one solved challenge then permits repeated token-less form entries for five minutes.
The record
- CVE
- CVE-2026-15239
- Published
- Aug 7, 2026
- Updated
- Aug 7, 2026
- Vendor
- RelyWP
- Product
- Simple CAPTCHA with Cloudflare Turnstile
- Classifications
- CWE-345, T1190
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 7, 2026CVE publishedPublication date reported by the CVE source.
- Aug 7, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <1.42.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- WPScan Forminator validation-cache replay proof of conceptfunctional · validated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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