Executive Summary

This vulnerability is a Broken Access Control issue in the WordPress Site Offline plugin (up to version 1.5.7). It occurs because certain plugin functions lack proper authorization, authentication, or nonce token checks. As a result, users with low-level privileges (Subscriber-level) can perform actions that should be restricted to higher-privileged users. [1]

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Impact Analysis

The vulnerability allows unprivileged users to execute actions reserved for higher-privileged users, potentially leading to unauthorized changes or disruptions on the affected WordPress site. Although the severity is considered low (CVSS score 4.3) and exploitation likelihood is limited, it still poses a security risk. Since the plugin is abandoned with no official fix, users are advised to remove or replace the plugin or apply virtual patching to mitigate the risk. [1]

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Detection Guidance

Detection of this vulnerability involves checking if the WordPress Site Offline plugin version 1.5.7 or earlier is installed and active. Since the vulnerability arises from broken access control allowing Subscriber-level users to perform higher-privilege actions, monitoring for unusual privilege escalations or unauthorized actions by low-privileged users is recommended. Plugin-based malware scanners may be unreliable for this issue. Specific commands are not provided, but verifying plugin version via WordPress CLI (e.g., `wp plugin list`) and auditing user actions/logs for unauthorized access attempts can help detect exploitation. [1]

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Mitigation Strategies

Immediate mitigation steps include removing and replacing the vulnerable Site Offline plugin with an alternative solution, as no official patch or update is available. Deactivating the plugin alone does not eliminate the risk unless a virtual patch (vPatch) is applied. Patchstack offers virtual patching technology that can automatically mitigate this vulnerability. Users should consider applying such virtual patches and seek professional incident response if compromise is suspected. [1]

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