CVE-2023-6731 in WP Show Posts Plugin
Summary
by MITRE • 05/02/2024
The WP Show Posts plugin for WordPress is vulnerable to unauthorized access of data due to a missing capability check on multiple AJAX functions in all versions up to, and including, 1.1.5. This makes it possible for authenticated attackers, with subscriber access and above, to view arbitrary post metadata, list posts, and view terms and taxonomies.
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Analysis
by VulDB Data Team • 03/05/2025
The WP Show Posts plugin for WordPress presents a critical authorization vulnerability that undermines the security model of WordPress installations. This vulnerability stems from insufficient capability checks within the plugin's AJAX handlers, creating a pathway for unauthorized data access that extends beyond normal user permissions. The flaw affects all versions up to and including 1.1.5, making it a widespread concern across numerous WordPress deployments. Attackers with subscriber-level access or higher can exploit this weakness to access sensitive post metadata, retrieve post listings, and obtain taxonomy information that should remain restricted to authorized users. The vulnerability represents a direct violation of the principle of least privilege that governs WordPress security architecture.
The technical implementation of this vulnerability lies in the plugin's AJAX endpoints which fail to verify user capabilities before processing requests. When authenticated users submit AJAX requests to the plugin's backend functions, the system does not validate whether the requesting user possesses sufficient permissions to access the requested data. This missing authorization check creates a persistent security gap that allows attackers to manipulate API calls and extract information that would normally be protected by WordPress's capability system. The vulnerability affects multiple AJAX functions within the plugin, amplifying the potential impact of exploitation. According to CWE-863, this represents a failure to enforce proper access control, specifically categorized as "Incorrect Authorization" where the system fails to verify that the user has the necessary privileges to perform the requested operation.
The operational impact of this vulnerability extends beyond simple data exposure, as it enables attackers to gather comprehensive information about the WordPress site's content structure and taxonomy relationships. Subscribers and users with higher privileges can enumerate posts, access metadata that may contain sensitive information, and discover relationships between terms and taxonomies that could aid in further exploitation attempts. This information gathering capability provides attackers with valuable reconnaissance data that could be used to plan more sophisticated attacks against the WordPress installation. The vulnerability's presence in the AJAX handling layer means that exploitation can occur through normal user interactions without requiring specialized tools or techniques, making it particularly dangerous for widespread compromise.
Organizations should implement immediate mitigations to address this vulnerability, including updating to the latest version of the WP Show Posts plugin where the capability checks have been implemented. System administrators should also consider implementing additional monitoring to detect unusual AJAX activity patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of proper access control implementation in WordPress plugins and aligns with ATT&CK technique T1078.004 for Valid Accounts and T1213.002 for Data from Information Repositories, highlighting how unauthorized access to content metadata can lead to broader compromise opportunities. Security teams should also review other plugins for similar authorization gaps and implement automated scanning to identify such vulnerabilities before they can be exploited by malicious actors.