CVE-2020-11028 in WordPress
Summary
by MITRE
In affected versions of WordPress, some private posts, which were previously public, can result in unauthenticated disclosure under a specific set of conditions. This has been patched in version 5.4.1, along with all the previously affected versions via a minor release (5.3.3, 5.2.6, 5.1.5, 5.0.9, 4.9.14, 4.8.13, 4.7.17, 4.6.18, 4.5.21, 4.4.22, 4.3.23, 4.2.27, 4.1.30, 4.0.30, 3.9.31, 3.8.33, 3.7.33).
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Analysis
by VulDB Data Team • 05/06/2025
This vulnerability in WordPress represents a critical access control flaw that undermines the platform's security model for private content management. The issue affects versions prior to 5.4.1 and specifically targets the handling of posts that were previously public but have been changed to private status. When certain conditions are met, these previously public posts can be accessed by unauthenticated users, effectively bypassing WordPress's built-in permission controls. The vulnerability stems from improper handling of post visibility states during the transition from public to private status, creating a window where content that should remain restricted becomes accessible to anyone with knowledge of the specific URL pattern. This represents a significant weakening of WordPress's content security architecture, as it allows unauthorized access to sensitive information that was intended to be protected. The flaw demonstrates a failure in the platform's privilege enforcement mechanisms, where the system does not properly validate access permissions for content that has undergone status changes.
The technical implementation of this vulnerability involves a race condition or state management issue within WordPress's post handling logic. When posts transition from public to private status, the system fails to properly invalidate cached access permissions or update access control lists for previously cached content. This creates a scenario where an attacker can exploit the timing gap between when a post is marked as private and when the access controls are fully enforced. The vulnerability is particularly concerning because it affects content that was previously accessible to the public, meaning that any sensitive information that was temporarily exposed during the transition period could be accessed by unauthorized parties. This flaw operates at the application layer and can be exploited through standard web requests without requiring any special privileges or authentication credentials, making it particularly dangerous in environments where WordPress is used for content management with sensitive data.
The operational impact of this vulnerability extends beyond simple information disclosure, as it represents a fundamental breach of content confidentiality within WordPress installations. Organizations using WordPress for managing sensitive content, including internal communications, proprietary information, or personal data, face potential exposure of confidential material when affected versions are in use. The vulnerability affects all previously affected versions through the minor release patches, indicating that the issue has been present across multiple major WordPress releases, suggesting a systemic problem in how the platform handles post status transitions. Attackers can leverage this vulnerability to gain access to content that was previously accessible to the public but has been changed to private status, potentially exposing sensitive business information, personal data, or internal communications. The impact is particularly severe for organizations that rely on WordPress for content management, as it undermines the trust model that users place in the platform's security controls.
Mitigation strategies for this vulnerability focus on immediate patching of affected WordPress installations to versions 5.4.1 or later, with the additional minor releases providing backward compatibility for older versions. Organizations should prioritize updating their WordPress installations and verify that all previously affected versions have been properly patched. Security teams should also implement monitoring for unauthorized access attempts to previously public content that has been marked as private, as this can serve as an indicator of exploitation attempts. Additionally, administrators should review their WordPress configuration and ensure that proper access controls are in place for content management systems, including regular security audits of post status transitions and access control implementations. The vulnerability highlights the importance of proper state management in web applications and the need for thorough testing of permission transitions in content management systems. Organizations should also consider implementing additional security measures such as web application firewalls and access logging to detect potential exploitation attempts. This vulnerability serves as a reminder of the critical importance of maintaining up-to-date security patches and proper access control validation in content management systems. The flaw aligns with common weakness enumerations related to access control failures and improper privilege management, and represents a significant concern for organizations operating WordPress platforms without proper security updates.