CVE-2026-28140 in JetFormBuilder Plugin
Summary
by MITRE • 08/06/2026
Unauthenticated Broken Access Control in JetFormBuilder <= 3.6.4.1 versions.
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Analysis
by VulDB Data Team • 08/06/2026
This vulnerability represents a critical authorization flaw that allows unauthorized users to bypass access controls within the JetFormBuilder plugin for WordPress. The issue stems from insufficient validation of user authentication status during sensitive operations, enabling attackers to perform administrative actions without proper credentials. The vulnerability specifically affects versions prior to 3.6.4.1 and manifests as an improper access control mechanism where the plugin fails to verify whether requests originate from authenticated administrators or legitimate users.
The technical implementation flaw occurs when the plugin processes requests for form management, configuration changes, or data exports without verifying that the requesting user possesses appropriate administrative privileges. This broken access control pattern creates multiple attack vectors allowing malicious actors to manipulate forms, access sensitive data, modify plugin settings, and potentially escalate their privileges within the WordPress environment. The vulnerability directly maps to cwe-284 which describes inadequate access control mechanisms in software applications.
Operational impact of this vulnerability extends beyond simple unauthorized access to include potential data breaches, form manipulation, and complete administrative compromise of affected WordPress installations. Attackers can exploit this flaw to inject malicious code into forms, steal form submissions, modify user permissions, or even gain full control over the WordPress site. The risk is particularly elevated in environments where JetFormBuilder is used for sensitive data collection such as contact forms, registration systems, or payment processing interfaces. This vulnerability aligns with attack techniques described in the attack pattern taxonomy under privilege escalation and unauthorized access categories.
Mitigation strategies should focus on immediate plugin updates to version 3.6.4.1 or later where the access control issues have been addressed. System administrators must also implement additional security measures including regular monitoring of user activities, implementing strong authentication controls, and reviewing user permissions regularly. Network-level protections such as web application firewalls can help detect and block exploitation attempts while maintaining proper logging of all administrative activities. Organizations should conduct comprehensive security audits to identify other potential access control vulnerabilities within their WordPress installations and ensure that all plugins and themes maintain current versions with known security patches applied.