WordPressプラグイン「BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP」に認可の欠如の脆弱性（CVE-2026-19801）
概要
WordPressプラグイン「BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP」に認可の欠如の脆弱性が確認されました。
バージョン 3.1.0 以前に影響があります。
修正版 3.1.1 への更新が推奨されます。
脆弱性の基本情報
| 脆弱性ID |
CVE-2026-19801 WF-faf44730-b975-4057-96dc-7284775500f9 |
|---|---|
| 脆弱性の種類 | 認可の欠如 |
| 危険度 | 中 |
| CVSSスコア |
4.3（CVSS v3.1） CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| 公開日 | 2026年8月24日 |
| 更新日 | 2026年8月25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「BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP」 |
3.1.0 以前 | 3.1.1 | Wordfence Intelligence |
推奨対応
- WordPressプラグイン「BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP」を修正版 3.1.1 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
BetterLinks <= 3.1.0 - Missing Authorization to Authenticated (Subscriber+) Arbitrary Short URL Creation via create_fbs_link AJAX Action
The BetterLinks – Link Shortener, Link Cloaking, Redirects, Affiliate Link Manager & MCP plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 3.1.0. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for authenticated attackers, with subscriber-level access and above, to create arbitrary BetterLinks short URLs with attacker-controlled slugs and redirect destinations, enabling phishing and SEO abuse. Exploitation requires the Fluent Boards companion plugin to be installed and active (so that the FLUENT_BOARDS constant is defined), and is further facilitated by the betterlinks_admin_nonce nonce being emitted on every frontend page via wp_localize_script, making it accessible to any authenticated user.
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