WordPressプラグイン「WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)」に不適切な認証の脆弱性（CVE-2026-104759）
概要
WordPressプラグイン「WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)」に不適切な認証の脆弱性が確認されました。
バージョン 44.1 以前に影響があります。
修正版 45.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-104759 WF-aad7ddac-ed12-4263-8e68-64b1fca8dfad |
|---|---|
| 脆弱性の種類 | 不適切な認証 |
| 危険度 | 高 |
| CVSSスコア |
8.1（CVSS v3.1） CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 公開日 | 2026年10月9日 |
| 更新日 | 2026年10月10日 |
影響を受ける製品
| 製品 | 影響を受けるバージョン | 修正版 | 出典 |
|---|---|---|---|
| WordPressプラグイン「WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)」 |
44.1 以前 | 45.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)」を修正版 45.0 またはそれ以降の公式最新版へ更新してください。
情報元の原文
Wordfence Intelligence
WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) <= 44.1 - Unauthenticated Authentication Bypass via OIDC Nonce Replay via id_token Nonce Verification
The WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) plugin for WordPress is vulnerable to Authentication Bypass via OIDC Nonce Replay in all versions up to, and including, 44.1 This is due to `Id_Token_Service_Deprecated::process_openidconnect_token()` using the incompatible WordPress core `wp_verify_nonce()` function to validate a nonce produced by `Nonce_Service::create_nonce()` — a 64-character hex value that `wp_verify_nonce()` can never successfully verify — causing the nonce check to silently fail without terminating authentication, so execution continues into `authenticate_oidc_user()` with the attacker-supplied `id_token`. This makes it possible for unauthenticated attackers who have obtained a previously-issued, valid `id_token` for a target account to replay that token and authenticate as any WordPress user, including administrators, resulting in full site takeover. This vulnerability is only exploitable when the `use_id_token_parser_v2` plugin option is enabled, as this is the configuration that routes token processing through the deprecated parser containing the broken nonce check.
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