WordPressプラグイン「JWT Authentication for WP REST APIs」に脆弱性（CVE-2026-89027）
概要
WordPressプラグイン「JWT Authentication for WP REST APIs」に脆弱性が確認されました。
バージョン 4.7.0 以前に影響があります。
修正版 4.8.0 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-89027 WF-18bb20d5-325c-4a72-890c-edd38ab03cea |
|---|---|
| 脆弱性の種類 | CWE-693 |
| 危険度 | 中 |
| CVSSスコア |
5.3（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| 公開日 | 2026年9月14日 |
| 更新日 | 2026年9月16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「JWT Authentication for WP REST APIs」 |
4.7.0 以前 | 4.8.0 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「JWT Authentication for WP REST APIs」を修正版 4.8.0 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
JWT Authentication for WP REST APIs <= 4.7.0 - Unauthenticated Authentication Method Downgrade via 'mo_rest_api_test_config' Parameter
The JWT Authentication for WP REST APIs plugin for WordPress is vulnerable to authentication method downgrade in all versions up to, and including, 4.7.0. This is due to the plugin honoring the 'mo_rest_api_test_config' request parameter in the mo_api_auth_is_valid_request() function without a capability check or nonce verification, which selects the authentication handler for the request. This makes it possible for unauthenticated attackers to force protected REST API requests to be validated with HTTP Basic Authentication against WordPress user credentials, regardless of the JWT, API key, or client-credentials method the administrator configured, and to guess credentials without the rate limiting applied to the other methods.
Copyright 2012-2026 Defiant Inc.
Defiant hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute this software vulnerability information. Any copy of the software vulnerability information you make for such purposes is authorized provided that you include a hyperlink to this vulnerability record and reproduce Defiant's copyright designation and this license in any such copy.
Copyright 1999-2026 The MITRE Corporation
CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE®). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy.