WordPressプラグイン「One User Avatar | User Profile Picture」に危険なファイルのアップロードの脆弱性（CVE-2026-18983）
概要
WordPressプラグイン「One User Avatar | User Profile Picture」に危険なファイルのアップロードの脆弱性が確認されました。
バージョン 2.5.4 以前に影響があります。
修正版 2.5.5 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-18983 WF-f413b610-839a-4a93-aec5-b6566371ccb7 |
|---|---|
| 脆弱性の種類 | 危険なファイルのアップロード |
| 危険度 | 高 |
| CVSSスコア |
7.5（CVSS v3.1） CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
| 公開日 | 2026年8月27日 |
| 更新日 | 2026年8月28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「One User Avatar | User Profile Picture」 |
2.5.4 以前 | 2.5.5 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「One User Avatar | User Profile Picture」を修正版 2.5.5 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
One User Avatar | User Profile Picture <= 2.5.4 - Authenticated (Subscriber+) Stored Cross-Site Scripting via wpua-file Parameter
The One User Avatar | User Profile Picture plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 2.5.4 via the wpua_action_process_option_update function. This is due to insufficient file type validation in wp_handle_upload() called without a MIME allow-list, with post-write validation relying on the attacker-controlled client-supplied Content-Type header rather than a server-derived type, and no cleanup of files that fail the check. This makes it possible for authenticated attackers, with subscriber-level access and above, to upload files that may be executable, which makes remote code execution possible. in order to exploit this vulnerability an admin has to give subscribers permission to upload avatars. While PHP files and svg files are rejected, dxfp files are accepted.
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