Nexter Extension – Security, Performance, Code Snippets & Site Toolkit に脆弱性 — CVE-2026-111114
いま何をすべきか
Nexter Extension – Security, Performance, Code Snippets & Site Toolkit を 4.7.12 以降に更新してください。
影響を受けるバージョン
- 4.7.11 以下のすべて
対象: プラグイン「Nexter Extension – Security, Performance, Code Snippets & Site Toolkit」(nexter-extension)
何が起きるのか
The Nexter Extension – Security, Performance, Code Snippets & Site Toolkit plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 4.7.11 The vulnerability exists because the `/?reset-view` handler in `role_switcher_to_view_admin_as()` performs no nonce or capability check when the supplied username matches the authenticated caller, and because the plugin's only cleanup mechanism — the `profile_update` hook — does not fire when WordPress performs a bulk role change via `wp-admin/users.php?action=promote`, which calls `WP_User::set_role()` directly and leaves a stale `administrator` value in the `nxtext_view_admin_original_role` user meta. This makes it possible for authenticated attackers with Subscriber-level access or above to restore the stale stored Administrator role to their own account, effectively escalating their privileges to Administrator. Exploitation requires that the attacker's account previously held the Administrator role and used the View Admin Role Switcher feature before being demoted specifically through the bulk role-change control rather than the Edit User screen, as only the bulk path bypasses the `profile_update` hook that would otherwise have cleared the stored original role.
ここから先の選択肢
1. 自分たちで対応する
更新の手順、バックアップの取り方、壊れたときの戻し方をまとめています。
2. いまの制作会社・保守業者に頼む
Nexter Extension – Security, Performance, Code Snippets & Site Toolkit を使っているかどうかを含めて確認を依頼してください。 無料診断を実行すると、そのまま渡せる依頼文を作れます。
3. 相談先がない・自分では難しい
連絡が取れる相手がいない、管理画面に入れない、侵入された疑いがある。 そうした場合はご相談ください。
出典
- https://plugins.trac.wordpress.org/browser/nexter-extension/tags/4.7.11/include/panel-settings/extensions/nexter-ext-view-admin-role.php#L265
- https://plugins.trac.wordpress.org/browser/nexter-extension/tags/4.7.11/include/panel-settings/extensions/nexter-ext-view-admin-role.php#L287
- https://plugins.trac.wordpress.org/browser/nexter-extension/tags/4.7.11/include/panel-settings/extensions/nexter-ext-view-admin-role.php#L302
- https://plugins.trac.wordpress.org/browser/nexter-extension/tags/4.7.11/include/panel-settings/extensions/nexter-ext-view-admin-role.php#L51
- https://plugins.trac.wordpress.org/changeset/3740891/nexter-extension/trunk/include/panel-settings/extensions/nexter-ext-view-admin-role.php
- https://www.wordfence.com/threat-intel/vulnerabilities/id/ae86441d-5a95-45a7-869a-9e7872365a1f?source=cve