WordPressプラグイン「EWWW Image Optimizer」にファイル名・パスの外部制御の脆弱性（CVE-2026-91072）
概要
WordPressプラグイン「EWWW Image Optimizer」にファイル名・パスの外部制御の脆弱性が確認されました。
バージョン 8.7.0 以前に影響があります。
修正版 8.8.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-91072 WF-ab6b9d89-cccc-4a95-9cd1-80725187974f |
|---|---|
| 脆弱性の種類 | ファイル名・パスの外部制御 |
| 危険度 | 中 |
| CVSSスコア |
4.7（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L |
| 公開日 | 2026年9月28日 |
| 更新日 | 2026年10月9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「EWWW Image Optimizer」 |
8.7.0 以前 | 8.8.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「EWWW Image Optimizer」を修正版 8.8.0 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
EWWW Image Optimizer <= 8.7.0 - Authenticated (Administrator+) Cross-Site WebP File Deletion or Rename
The EWWW Image Optimizer plugin for WordPress is vulnerable to Arbitrary File Deletion in all versions up to, and including, 8.7.0. This is due to missing upload-directory scope enforcement in the WebP migration file-operation routine, allowing paths outside the current site's uploads folder on multisite. This makes it possible for authenticated attackers, with administrator-level access and above, to rename or delete WebP-derivative image files outside their own site's uploads directory, including files belonging to other sites on a multisite network.
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