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Authentication Bypass by Spoofing vulnerability in WP Maintenance allows Accessing Functionality Not Properly Constrained by ACLs.This issue affects WP Maintenance: from n/a through 6.1.3.
The WP Maintenance plugin for WordPress is vulnerable to Information Exposure in all versions up to, and including, 6.1.6 via the REST API. This makes it possible for unauthenticated attackers to bypass the plugin's maintenance mode obtain post and page content via REST API.
The WP Maintenance plugin for WordPress is vulnerable to IP Address Spoofing in all versions up to, and including, 6.1.9.2 due to insufficient IP address validation and use of user-supplied HTTP headers as a primary method for IP retrieval. This makes it possible for unauthenticated attackers to bypass maintenance mode.