CVE-2026-39741 in Simple Cloudflare Turnstile Plugin
Summary
by MITRE • 10/29/2026
Missing Authorization vulnerability in RelyWP Simple Cloudflare Turnstile simple-cloudflare-turnstile allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Simple Cloudflare Turnstile: from n/a through 1.44.0.
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Analysis
by VulDB Data Team • 10/29/2026
The identified vulnerability represents a critical failure in access control mechanisms within the RelyWP Simple Cloudflare Turnstile plugin, specifically affecting versions ranging from initial releases up to version 1.44.0. This flaw is categorized under CWE-285, which describes Improper Authorization, indicating that the software fails to properly verify whether an authenticated user has the necessary permissions to perform a specific action or access certain resources. In the context of web applications and WordPress plugins, such vulnerabilities often arise when developers rely on client-side checks for security decisions rather than enforcing strict server-side validation. This architectural oversight allows attackers who have valid credentials but insufficient privileges to bypass intended restrictions and execute administrative functions or manipulate data in ways that were not authorized by the system administrator.
From a technical perspective, this misconfiguration likely involves endpoints within the plugin's API or administration interface where authorization checks are either absent or incorrectly implemented. An attacker could exploit this weakness by crafting specific HTTP requests that target these unprotected routes. Because the vulnerability stems from incorrect access control security levels, it implies that the application does not adequately distinguish between different user roles or fails to validate session tokens against the required permission sets before processing sensitive operations. This type of flaw is frequently associated with Broken Access Control attacks listed in the MITRE ATT&CK framework under technique T1078, which covers Valid Accounts and specifically relates to privilege escalation through improper access control configurations. The exploitation does not require complex buffer overflows or injection payloads but rather a precise understanding of the application's internal routing and permission logic.
The operational impact of this vulnerability is significant for any organization relying on Simple Cloudflare Turnstile for bot protection while managing user interactions. If an attacker successfully exploits this missing authorization flaw, they could potentially escalate their privileges to that of an administrator or gain access to sensitive configuration settings. This could lead to the compromise of the entire WordPress installation, as administrative access typically grants control over all plugins, themes, and core files. Furthermore, since the plugin deals with Cloudflare Turnstile integration, a compromised state might allow an attacker to manipulate security configurations, potentially disabling bot protection mechanisms or redirecting verification processes to malicious endpoints. This undermines the primary purpose of the software and exposes the underlying application infrastructure to further exploitation vectors such as remote code execution via uploaded files or database manipulation through SQL injection if other related vulnerabilities exist in conjunction with this access control failure.
Mitigation strategies must focus on immediate remediation and long-term security hardening. The most effective solution is to upgrade the Simple Cloudflare Turnstile plugin to a version later than 1.44.0, where developers have presumably addressed these authorization gaps by implementing robust server-side permission checks for all administrative actions. Until an update is available or if upgrading is not immediately feasible, administrators should restrict access to the WordPress admin area using IP whitelisting and enforce strong multi-factor authentication for all user accounts with elevated privileges. Additionally, deploying a Web Application Firewall can help detect and block anomalous request patterns that attempt to probe for unauthorized endpoints. Regular security audits and code reviews focusing on authorization logic are essential to prevent similar issues in future updates or custom integrations involving third-party plugins.