CVE-2023-4036 in Simple Blog Card Plugin
Summary
by MITRE • 08/30/2023
The Simple Blog Card WordPress plugin before 1.32 does not ensure that posts to be displayed via a shortcode are public, allowing any authenticated users, such as subscriber, to retrieve arbitrary post title and their content such as draft, private and password protected ones
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Analysis
by VulDB Data Team • 05/02/2025
The vulnerability identified in CVE-2023-4036 affects the Simple Blog Card WordPress plugin version 1.31 and earlier, representing a critical access control flaw that undermines the security model of WordPress content management systems. This issue stems from insufficient validation mechanisms within the plugin's shortcode functionality, which fails to properly verify the public accessibility status of posts before rendering their content. The flaw specifically targets the plugin's ability to display blog card information through shortcodes, creating an unauthorized data exposure scenario that extends beyond typical user permissions.
The technical implementation of this vulnerability resides in the plugin's failure to enforce WordPress's built-in post visibility controls during shortcode processing. When users invoke the plugin's shortcode functionality, the system should automatically check whether the targeted post is accessible to the current user context, particularly verifying that the post status is public and not restricted through draft, private, or password protection mechanisms. However, the vulnerable version does not perform these checks, allowing any authenticated user account to access content that should remain restricted. This represents a direct violation of the principle of least privilege and demonstrates a critical failure in the plugin's authorization logic.
From an operational perspective, this vulnerability creates significant security implications for WordPress sites utilizing the affected plugin. Any authenticated user, regardless of their role level including subscribers, can exploit this flaw to access draft posts, private content, and password-protected material that should only be visible to administrators or authorized users. The exposure extends beyond simple metadata to include full post content, potentially compromising sensitive business information, unpublished content, internal communications, or proprietary data that organizations rely on keeping confidential. This vulnerability effectively bypasses WordPress's core content access control mechanisms, creating a persistent security risk that can be exploited by both internal users and external attackers who gain access to legitimate user accounts.
The impact of this vulnerability aligns with CWE-284, which addresses improper access control, and can be mapped to ATT&CK technique T1213.002 related to data from information repositories. Attackers can leverage this flaw to conduct reconnaissance activities, gather intelligence about unpublished content, or extract sensitive information that could be used for social engineering, competitive advantage, or further exploitation attempts. The vulnerability is particularly concerning because it affects the fundamental content management capabilities of WordPress, potentially allowing attackers to discover internal business strategies, upcoming product launches, or confidential communications that should remain private.
Organizations should immediately update to version 1.32 or later of the Simple Blog Card plugin to remediate this vulnerability, as no effective workarounds exist for this specific access control flaw. Additionally, administrators should conduct comprehensive security audits of their WordPress installations to identify any other plugins that might exhibit similar authorization bypass vulnerabilities. The remediation process should include monitoring for unauthorized access attempts and implementing proper logging of shortcode usage to detect potential exploitation attempts. Security teams should also review user permissions and consider implementing additional access controls for WordPress installations, particularly for plugins that handle content display and user-facing functionality, to minimize the attack surface and ensure proper isolation of sensitive content.