ThirstyAffiliates – Affiliate Links, Link Branding, Link Tracking & Marketing Plugin — CVE-2026-119089

どんな問題か

The ThirstyAffiliates – Affiliate Links, Link Branding, Link Tracking & Marketing Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 3.12.1 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This vulnerability is only exploitable on block themes (such as Twenty Twenty-Five) where the Comment Content block causes comment HTML to flow through render_block, triggering the plugin's transformer. Additionally, a successful attack requires the attacker to have had one prior comment approved, after which subsequent crafted comments are auto-approved and rendered publicly.

自分のサイトが該当するかの確認手順

1. WordPressの管理画面にログインし、左メニュー「プラグイン」（またはテーマ）に ThirstyAffiliates – Affiliate Links, Link Branding, Link Tracking & Marketing Plugin があるか確認します。
2. あれば、バージョン番号を見て「対象バージョン」に当てはまるか確認します。
3. 当てはまる場合は「更新」ボタンで修正版へ。使っていないプラグインなら削除します。更新ボタンが出ない・怖くて押せない場合は、保守会社か当社へご相談ください。