WordPressプラグイン「Kirki – Freeform Page Builder, Website Builder & Customizer」に信頼できないデータのデシリアライズの脆弱性（CVE-2026-75891）
概要
WordPressプラグイン「Kirki – Freeform Page Builder, Website Builder & Customizer」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 6.2.5 以前に影響があります。
修正版 6.3.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-75891 WF-aecfea73-97fc-48c3-bf1b-5314077739b5 |
|---|---|
| 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:L/UI:N/S:U/C:H/I:H/A:H |
| 公開日 | 2026年10月26日 |
| 更新日 | 2026年10月27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「Kirki – Freeform Page Builder, Website Builder & Customizer」 |
6.2.5 以前 | 6.3.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Kirki – Freeform Page Builder, Website Builder & Customizer」を修正版 6.3.0 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
Kirki <= 6.2.5 - Authenticated (Subscriber+) PHP Object Injection to Administrator Account Takeover via 'get-single-symbol' AJAX Endpoint
The Kirki plugin for WordPress is vulnerable to Privilege Escalation via PHP Object Injection in all versions up to, and including, 6.2.5 via deserialization of untrusted input through the 'get-single-symbol' branch of the kirki_post_apis() AJAX dispatcher due to a missing capability check. This makes it possible for authenticated attackers, with Subscriber-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to overwrite an administrator's password and gain administrative access.
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