CVE-2024-9636 in Post Grid and Gutenberg Blocks Plugin
Summary
by MITRE • 01/15/2025
The Post Grid and Gutenberg Blocks plugin for WordPress is vulnerable to privilege escalation in versions 2.2.85 to 2.3.3. This is due to the plugin not properly restricting what user meta can be updated during profile registration. This makes it possible for unauthenticated attackers to register on the site as an administrator.
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Analysis
by VulDB Data Team • 06/11/2026
The vulnerability in the Post Grid and Gutenberg Blocks plugin represents a critical privilege escalation flaw that undermines the fundamental security model of WordPress installations. This issue affects versions ranging from 2.2.85 through 2.3.3, creating a persistent risk for affected systems. The vulnerability stems from inadequate input validation and access control mechanisms within the plugin's user registration and profile management functionality. Attackers can exploit this weakness to manipulate user meta data during the registration process, effectively bypassing normal authentication and authorization controls that should prevent unauthorized administrative access.
The technical implementation of this vulnerability allows unauthenticated attackers to manipulate the registration process by injecting malicious user meta information that would normally require administrative privileges to set. This flaw directly violates the principle of least privilege and demonstrates a failure in the plugin's security architecture. The vulnerability is categorized under CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on insufficient access control mechanisms. The flaw operates at the application level within the WordPress user management system, where proper sanitization and validation of user input should occur during registration procedures.
The operational impact of this vulnerability is severe as it allows attackers to gain full administrative control over affected WordPress sites without requiring any legitimate credentials. This creates a persistent backdoor that can be exploited repeatedly, potentially leading to complete compromise of the web application and underlying server infrastructure. The vulnerability enables attackers to modify site content, install malicious plugins, access sensitive data, and establish persistence within the target environment. From an adversarial perspective, this vulnerability maps to attack techniques described in the MITRE ATT&CK framework under privilege escalation and credential access domains, specifically targeting the T1078 credential access technique and T1068 local privilege escalation.
Organizations running affected plugin versions face significant risk exposure that requires immediate remediation. The recommended mitigation strategy involves upgrading to the latest plugin version where this vulnerability has been patched and addressed. System administrators should also implement additional security measures including monitoring for unusual registration patterns, implementing rate limiting on registration endpoints, and conducting thorough security audits of all installed plugins. The vulnerability highlights the importance of proper input validation and access control implementation within WordPress plugins, emphasizing that third-party components can introduce critical security risks that affect entire application ecosystems. Regular security assessments and vulnerability scanning should be implemented to identify similar issues in other plugins and prevent exploitation of similar privilege escalation vectors.