CVE-2024-3590 in LetterPress Plugin
Summary
by MITRE • 05/14/2024
The LetterPress WordPress plugin through 1.2.2 does not have CSRF checks in some places, which could allow attackers to make logged in users perform unwanted actions via CSRF attacks, such as delete arbitrary subscribers
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Analysis
by VulDB Data Team • 03/31/2025
The LetterPress WordPress plugin version 1.2.2 and earlier contains a critical cross-site request forgery vulnerability that compromises the security of authenticated users. This vulnerability stems from the absence of proper CSRF protection mechanisms within specific administrative functions of the plugin, creating a significant attack surface that malicious actors can exploit to perform unauthorized actions on behalf of legitimate users. The flaw specifically affects the plugin's ability to validate the authenticity of requests originating from the user's browser, allowing attackers to craft malicious requests that appear legitimate to the WordPress system.
The technical implementation of this vulnerability lies in the plugin's failure to implement anti-CSRF tokens or referer validation in key administrative endpoints. When users are logged into their WordPress admin panel while the LetterPress plugin is active, attackers can leverage this weakness to execute unauthorized operations such as deleting subscriber accounts or performing other administrative tasks without the user's knowledge or consent. This occurs because the plugin does not verify that requests are originating from legitimate sources within the same session, enabling attackers to construct malicious payloads that exploit the trust relationship between the user's browser and the WordPress installation.
The operational impact of this vulnerability extends beyond simple account deletion, as it represents a fundamental breakdown in the plugin's security architecture that could enable more sophisticated attacks. An attacker could potentially use this vulnerability to escalate privileges, modify user roles, or manipulate content within the WordPress environment. The vulnerability is particularly dangerous because it requires no special privileges or credentials from the attacker beyond the ability to entice a logged-in user to visit a malicious website or click on a crafted link. This makes the attack vector highly effective in social engineering campaigns where users are tricked into visiting compromised sites while maintaining active sessions with WordPress.
Organizations using the LetterPress plugin should immediately implement mitigations including updating to the latest version of the plugin where the CSRF vulnerability has been addressed, implementing additional security measures such as wp_nonce_field() validation in custom plugin code, and monitoring for suspicious administrative activities. The vulnerability aligns with CWE-352, which specifically addresses Cross-Site Request Forgery, and represents a clear violation of the principle of least privilege and proper authentication validation. From an ATT&CK perspective, this vulnerability maps to techniques involving privilege escalation and credential access through web application exploitation, potentially enabling adversaries to maintain persistence within WordPress environments. Security professionals should also consider implementing web application firewalls and monitoring for unusual administrative requests that could indicate CSRF attack attempts.