Password Protected – Protect Your Site Content With a Password — CVE-2026-93293

どんな問題か

The Password Protected plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the bundled Freemius SDK's purchase-completion handler in all versions up to, and including, 2.8.4 due to insufficient input sanitization and output escaping. Once the site's Freemius opt-in is complete (the normal state after an administrator clicks "Allow & Continue"), the handler processes the 'purchased_plan' request parameter on any wp-admin request from an authenticated user without any capability, nonce, or purchase validation, and stores it in a persistent, site-wide administrative notice. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts that execute automatically when an administrator views a standard admin page such as their Profile page.

自分のサイトが該当するかの確認手順

1. WordPressの管理画面にログインし、左メニュー「プラグイン」（またはテーマ）に Password Protected – Protect Your Site Content With a Password があるか確認します。
2. あれば、バージョン番号を見て「対象バージョン」に当てはまるか確認します。
3. 当てはまる場合は「更新」ボタンで修正版へ。使っていないプラグインなら削除します。更新ボタンが出ない・怖くて押せない場合は、保守会社か当社へご相談ください。