CVE-2026-115595 in Contact Form Plugin
Summary
by MITRE • 10/26/2026
Missing Authorization vulnerability in Supsystic Contact Form by Supsystic contact-form-by-supsystic allows Exploiting Incorrectly Configured Access Control Security Levels.This issue affects Contact Form by Supsystic: from n/a through 1.10.7.
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Analysis
by VulDB Data Team • 10/26/2026
The vulnerability identified in the Supsystic Contact Form plugin, specifically affecting versions up to and including 1.10.7, represents a critical failure in access control mechanisms within WordPress-based web applications. This flaw is categorized under CWE-284, which describes Improper Access Control, and aligns with MITRE ATT&CK technique T1065, indicating Untrusted Search Path or similar misconfigurations that allow unauthorized entities to bypass intended security boundaries. The core issue stems from the plugin's inability to properly verify user permissions before processing sensitive operations, such as form submissions, data exports, or administrative configuration changes. In a typical WordPress environment, certain actions are restricted to users with specific roles like Administrator or Editor, yet this vulnerability allows attackers who may have minimal privileges, including subscribers or even unauthenticated visitors depending on the site's broader security posture, to execute these privileged functions without adequate authorization checks.
From a technical perspective, the flaw likely resides in the server-side logic that handles requests related to form management and data handling. When an HTTP request is received by the plugin, it fails to validate whether the initiating user possesses the necessary rights defined by WordPress capabilities or custom role definitions implemented by the developer. This oversight enables attackers to manipulate parameters within API endpoints or AJAX handlers associated with the contact form functionality. By crafting specific requests that target these unprotected endpoints, malicious actors can perform actions such as modifying form settings, accessing submitted customer data, or potentially injecting malicious content into forms if input validation is also compromised. The absence of robust session-based or token-based verification mechanisms further exacerbates this risk, allowing for straightforward exploitation through simple HTTP request manipulation tools like curl or Burp Suite without requiring complex exploit chains.
The operational impact of this vulnerability extends beyond mere unauthorized access to administrative features. Since contact forms often collect personally identifiable information (PII) such as names, email addresses, phone numbers, and sometimes more sensitive data depending on the form fields configured, an attacker gaining control over these functions can lead to significant data breaches. Furthermore, if the plugin allows for file uploads or integration with external services, the lack of authorization checks could facilitate further compromise of the underlying web server or database. Attackers might use this entry point to deface websites by altering public-facing form displays, spam users through automated submissions enabled via admin settings changes, or establish persistence mechanisms within the WordPress installation. The broader implication is a degradation of trust in the application's security model, potentially leading to compliance violations under regulations like GDPR if customer data is exposed due to inadequate access controls.
Mitigation strategies for this vulnerability require immediate action by site administrators and developers. The primary recommendation is to update the Supsystic Contact Form plugin to version 1.10.8 or later, where these authorization checks have presumably been corrected in subsequent releases. For organizations unable to upgrade immediately due to compatibility concerns with other plugins or custom code modifications, temporary mitigations include restricting access to WordPress admin areas using IP whitelisting if feasible, implementing Web Application Firewall rules that detect and block anomalous requests targeting known vulnerable endpoints associated with this plugin version, and auditing user roles to ensure no unnecessary privileges are granted. Additionally, developers should review the implementation of capability checks in custom code interacting with the plugin's API, ensuring that all sensitive operations verify current_user_can() or equivalent permission functions before execution. Regular security audits and penetration testing focused on access control flaws can help identify similar weaknesses across other plugins installed within the same environment, thereby strengthening the overall defense-in-depth posture against unauthorized access attempts.