CVE-2024-2125 in EnvíaloSimple Plugin
Summary
by MITRE • 04/09/2024
The EnvíaloSimple: Email Marketing y Newsletters plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 2.3. This is due to missing or incorrect nonce validation on the gallery_add function. This makes it possible for unauthenticated attackers to upload malicious files via a forged request granted they can trick a site administrator into performing an action such as clicking on a link. The Cross-Site Request Forgery was patched in 2.4, however, nothing was done about the ability to upload arbitrary files.
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Analysis
by VulDB Data Team • 04/14/2026
The CVE-2024-2125 vulnerability affects the EnvíaloSimple WordPress plugin, specifically targeting versions up to and including 2.3. This plugin serves as an email marketing and newsletter solution, making it a critical component for many WordPress sites. The vulnerability manifests as a cross-site request forgery flaw that stems from inadequate nonce validation within the gallery_add function. Nonce validation represents a fundamental security mechanism designed to prevent unauthorized actions by ensuring that requests originate from legitimate sources within the same session context. The absence of proper nonce verification creates a pathway for malicious actors to manipulate the plugin's functionality through forged requests.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious request that leverages the gallery_add function to upload files to the target WordPress installation. While the CSRF aspect requires social engineering to trick administrators into executing the malicious request, the underlying flaw allows for arbitrary file uploads. This represents a particularly dangerous combination because it enables attackers to bypass typical authentication mechanisms while exploiting a legitimate administrative function. The vulnerability directly maps to CWE-352, which defines Cross-Site Request Forgery as a weakness where a web application fails to validate that requests originate from the same user who initiated the session. The lack of proper nonce validation in this context removes the primary defense mechanism against CSRF attacks.
The operational impact of this vulnerability extends beyond simple file upload capabilities, as it creates a potential backdoor for attackers to establish persistent access to affected systems. When combined with the CSRF aspect, administrators who inadvertently click on malicious links could unknowingly execute file upload operations that could result in the deployment of web shells, malware, or other malicious payloads. The severity increases significantly because the plugin targets email marketing functionality, which often requires elevated privileges and can be integrated with various site components. Attackers could potentially use this vulnerability to compromise entire WordPress installations, especially when the plugin is configured with administrative privileges or integrated with other security-sensitive components. This vulnerability aligns with ATT&CK technique T1190, which describes the use of web shells and backdoors through exploitation of web application vulnerabilities.
The patch implemented in version 2.4 addresses the CSRF component by adding proper nonce validation to the gallery_add function, thereby preventing unauthorized request manipulation. However, the critical oversight remains in the file upload functionality itself, which continues to allow arbitrary file uploads without proper validation or sanitization. This partial remediation leaves the system vulnerable to continued exploitation, as attackers can still leverage the file upload capability to execute malicious code. Organizations should immediately update to version 2.4 or later to address the CSRF vulnerability, but they must also conduct thorough security audits of existing installations to identify any malicious files that may have been uploaded through this vulnerability. The vulnerability demonstrates the importance of comprehensive security testing that addresses all aspects of plugin functionality rather than focusing solely on the most obvious attack vectors. Security professionals should also implement additional monitoring and validation measures to detect unauthorized file uploads and ensure that the plugin's file handling mechanisms remain secure against future exploitation attempts.