WordPressプラグイン「MStore API – Create Native Android & iOS Apps On The Cloud」に不適切な認証の脆弱性（CVE-2026-13447）
概要
WordPressプラグイン「MStore API – Create Native Android & iOS Apps On The Cloud」に不適切な認証の脆弱性が確認されました。
バージョン 4.20.0 以前に影響があります。
修正版 4.21.1 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-13447 WF-4a1127af-74f6-4748-9aee-5a8c6c2766a4 |
|---|---|
| 脆弱性の種類 | 不適切な認証 |
| 危険度 | 重大 |
| CVSSスコア |
9.8（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| 公開日 | 2026年9月4日 |
| 更新日 | 2026年9月5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「MStore API – Create Native Android & iOS Apps On The Cloud」 |
4.20.0 以前 | 4.21.1 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「MStore API – Create Native Android & iOS Apps On The Cloud」を修正版 4.21.1 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
MStore API <= 4.20.0 - Unauthenticated Authentication Bypass via 'id_token' Parameter JWT Forgery
The Mstore Api plugin for WordPress is vulnerable to Authentication Bypass via JWT Forgery in versions up to, and including, 4.20.0 This is due to missing cryptographic signature verification in the FirebasePhoneAuthHelper::verify_id_token() function, which decodes and validates Firebase ID token claims (alg, kid, aud, iss) but never calls openssl_verify() or any equivalent to validate the JWT signature against Google's actual public key certificates. This makes it possible for unauthenticated attackers to forge a Firebase Phone Auth JWT signed with a self-generated RSA key pair and impersonate any phone number, resulting in unauthorized access to existing WordPress accounts or creation of new arbitrary accounts.
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