CVE-2026-81348 in My Private Site Plugin
Summary
by MITRE • 09/05/2026
The My Private Site WordPress plugin before 4.2.3 does not apply its site-privacy access control to certain unauthenticated front-end read surfaces, allowing unauthenticated users to view post content, comments and post URLs from a site the administrator placed behind mandatory login.
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Analysis
by VulDB Data Team • 09/07/2026
The vulnerability identified in versions of the My Private Site WordPress plugin prior to 4.2.3 represents a critical failure in access control enforcement for public-facing web interfaces. This flaw stems from an incomplete implementation of security controls, specifically where the plugin fails to consistently apply its site-wide privacy restrictions across all entry points within the application architecture. While the administrator configures the website to require mandatory authentication for general access, certain unauthenticated front-end read surfaces remain exposed and unprotected by these same restrictive measures. This inconsistency creates a significant gap in the security perimeter, allowing attackers to bypass intended authorization mechanisms through specific endpoints that were not properly secured during development or configuration.
From a technical perspective, this issue is classified under CWE-284 Improper Access Control, as the software does not adequately restrict access to resources for unauthorized actors. The core of the problem lies in the plugin's logic which governs how privacy settings are propagated through various WordPress hooks and template files. In many cases, developers may secure primary pages but neglect secondary read operations such as RSS feeds, specific AJAX handlers, or direct file requests that retrieve post metadata. Consequently, unauthenticated users can exploit these unprotected surfaces to access sensitive information including full post content, user comments, and the structural URLs of posts that are supposed to be hidden behind a login wall. This behavior effectively nullifies the privacy settings configured by the site administrator, rendering them ineffective against determined attackers who do not possess valid credentials.
The operational impact of this vulnerability is substantial for any organization or individual relying on My Private Site to maintain data confidentiality and restrict content visibility. Attackers can perform information disclosure attacks to harvest private text, user-generated comments, and internal link structures without triggering authentication prompts. This exposure facilitates further malicious activities such as social engineering, credential stuffing preparation by identifying valid usernames from comment sections, or reconnaissance for more advanced exploits targeting specific post types. The ability to view post URLs also aids in mapping the site's architecture, allowing attackers to identify potentially vulnerable endpoints that might not be linked publicly but are still accessible via direct URL manipulation. This undermines trust and can lead to compliance violations if sensitive personal data is inadvertently exposed due to this misconfiguration or code flaw.
To mitigate this risk, immediate action must be taken by updating the My Private Site plugin to version 4.2.3 or later where these access control checks have been corrected for all front-end read surfaces. Administrators should verify that no custom themes or additional plugins are overriding the privacy settings with less restrictive defaults. Furthermore it is advisable to implement a Web Application Firewall configured to detect and block unauthorized access attempts to sensitive endpoints even if the application layer remains vulnerable temporarily. Regular security audits focusing on authentication bypasses and improper access control patterns as defined by OWASP Top 10 standards should be conducted to ensure that all user-facing interfaces enforce consistent authorization policies regardless of the entry point used.