WordPressプラグイン「Welcart e-Commerce」に信頼できないデータのデシリアライズの脆弱性（CVE-2026-19887）
概要
WordPressプラグイン「Welcart e-Commerce」に信頼できないデータのデシリアライズの脆弱性が確認されました。
バージョン 2.12.1 以前に影響があります。
修正版 2.12.2 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-19887 WF-716a7c3c-2e26-4da9-a299-7dcbaa7e4895 |
|---|---|
| 脆弱性の種類 | 信頼できないデータのデシリアライズ |
| 危険度 | 高 |
| CVSSスコア |
8.8（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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「Welcart e-Commerce」 |
2.12.1 以前 | 2.12.2 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Welcart e-Commerce」を修正版 2.12.2 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
Welcart e-Commerce <= 2.12.1 - Unauthenticated Arbitrary File Deletion via PHP Object Injection via 'reserve' Checkout Parameter and 'option' EDY Callback
The Welcart e-Commerce plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 2.12.1 via deserialization of untrusted input in the Telecom EDY payment callback (usces_action_acting_transaction). Unauthenticated attackers can store arbitrary 'reserve' key/value pairs as order metadata during a public checkout, then invoke the callback with an attacker-chosen 'option' parameter to select and unserialize that metadata without any provider signature, source-address, transaction-identity or ownership check. A POP chain is present in the TCPDF library bundled with the plugin itself, so no additional plugin or theme is required. This makes it possible for unauthenticated attackers to delete arbitrary files on the server, including wp-config.php, which can lead to remote code execution when an attacker re-runs the WordPress installer against a database they control. Successful exploitation is contingent on an admin printing an invoice to trigger file deletion.
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