CVE-2025-23530 in Custom Post Type Lockdown Plugin
Summary
by MITRE • 01/16/2025
Cross-Site Request Forgery (CSRF) vulnerability in Yonatan Reinberg of Social Ink Custom Post Type Lockdown allows Privilege Escalation.This issue affects Custom Post Type Lockdown: from n/a through 1.11.
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Analysis
by VulDB Data Team • 02/10/2025
This cross-site request forgery vulnerability exists within the Custom Post Type Lockdown plugin for WordPress, specifically impacting versions ranging from n/a through 1.11. The flaw allows authenticated users to perform unauthorized actions on behalf of other users, creating a significant security risk for WordPress installations that rely on this plugin for content management. The vulnerability stems from insufficient validation of user requests, particularly in the privilege escalation mechanisms that control access to custom post types and their associated administrative functions. According to CWE-352, this represents a classic cross-site request forgery weakness where the application fails to verify that requests originate from legitimate sources, making it susceptible to exploitation by malicious actors who can craft forged requests that appear to come from authenticated users.
The technical implementation of this vulnerability occurs when the plugin fails to properly validate the referer header or implement anti-CSRF tokens during critical administrative operations. When an authenticated user accesses the plugin's administrative interfaces, the system should verify that the request originates from a legitimate source within the same domain and session. However, the absence of proper CSRF protection mechanisms means that an attacker can trick a logged-in user into executing unintended administrative actions, potentially escalating their privileges or modifying critical content. The vulnerability particularly affects the plugin's custom post type locking functionality, which is designed to prevent concurrent editing of content but instead becomes a vector for privilege escalation attacks.
The operational impact of this vulnerability extends beyond simple data modification, as it provides attackers with potential pathways to gain elevated privileges within the WordPress environment. An attacker who successfully exploits this CSRF vulnerability could potentially lock out legitimate users from editing content, modify post permissions, or even gain access to administrative functions that should be restricted to authorized personnel only. This creates a cascading security risk where the initial exploitation can lead to further compromise of the entire WordPress installation, particularly if the compromised user account has administrative privileges. The vulnerability is especially dangerous in environments where multiple users have access to the plugin's administrative features, as it can be exploited even when users are simply browsing malicious websites or clicking on compromised links.
Mitigation strategies should focus on implementing proper CSRF protection mechanisms including the use of anti-CSRF tokens that are generated for each user session and validated on every administrative request. The plugin developers should ensure that all critical functions require explicit user confirmation and implement proper referer validation checks. Organizations should also consider implementing additional security measures such as role-based access controls, regular security audits, and monitoring for unusual administrative activities. This vulnerability aligns with ATT&CK technique T1078 which covers valid accounts as a means of gaining access, where the CSRF attack effectively allows unauthorized privilege escalation through legitimate administrative interfaces. Regular updates to the plugin and adherence to security best practices including multi-factor authentication and secure session management are essential to prevent exploitation of this class of vulnerability. The vulnerability also highlights the importance of input validation and proper request verification as outlined in OWASP Top Ten category A05: Security Misconfiguration, where inadequate protection mechanisms create exploitable conditions for privilege escalation attacks.