WordPressプラグイン「Simply Schedule Appointments」にユーザー制御の鍵による認可回避（IDOR）の脆弱性（CVE-2026-91109）
概要
WordPressプラグイン「Simply Schedule Appointments」にユーザー制御の鍵による認可回避（IDOR）の脆弱性が確認されました。
バージョン 1.6.12.31 以前に影響があります。
修正版 1.6.12.33 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-91109 WF-d1cd3de2-16ca-4f95-ad6f-47cfbe00c959 |
|---|---|
| 脆弱性の種類 | ユーザー制御の鍵による認可回避（IDOR） |
| 危険度 | 中 |
| CVSSスコア |
6.5（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N |
| 公開日 | 2026年9月30日 |
| 更新日 | 2026年10月1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「Simply Schedule Appointments」 |
1.6.12.31 以前 | 1.6.12.33 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「Simply Schedule Appointments」を修正版 1.6.12.33 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
Simply Schedule Appointments <= 1.6.12.31 - Insecure Direct Object Reference to Authenticated (Subscriber+) Sensitive Information Disclosure via 'complete_group' Parameter
The Simply Schedule Appointments plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.6.12.31 via the 'complete_group' parameter due to missing validation on a user controlled key. This makes it possible for authenticated attackers, with subscriber-level access and above, to disclose every co-booker's private per-appointment id_token (exposed as public_token) alongside their PII (name and email address), then use each leaked token to read, overwrite arbitrary appointment meta on, or cancel the co-booker's appointment via the same REST controller. Exploitation requires the attacker to possess a valid id_token for any single appointment within the targeted group booking.
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