Ad Inserter – Ad Manager & AdSense Ads に脆弱性 — CVE-2026-19902
いま何をすべきか
Ad Inserter – Ad Manager & AdSense Ads を 2.8.19 以降に更新してください。
影響を受けるバージョン
- 2.8.18 以下のすべて
対象: プラグイン「Ad Inserter – Ad Manager & AdSense Ads」(ad-inserter)
何が起きるのか
The Ad Inserter – Ad Manager & AdSense Ads plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the Referer header in all versions up to, and including, 2.8.18 due to insufficient input sanitization and output escaping on the '{search-query}' dynamic tag. When an ad block's code contains that tag, replace_ai_tags() reads $_SERVER['HTTP_REFERER'] and tests it with the regex /[\.\/](google|yahoo|bing|ask)\.[a-z\.]{2,5}[\/]/i. The leading [\.\/] class matches a literal slash, so any referrer merely containing a segment such as '/google.com/' passes as a search-engine referral; the plugin then percent-decodes the referring query with parse_str() and substitutes the resulting 'q' (or 'p') value into the block via preg_replace() with no escaping. This makes it possible for unauthenticated attackers to execute arbitrary JavaScript in the context of the site for any visitor, including a signed-in administrator, by luring them to an attacker-controlled page that frames or links to any ordinary post. Exploitation requires the site to have an ad block whose code uses the '{search-query}' tag with automatic insertion enabled — a documented plugin feature used as intended.
ここから先の選択肢
1. 自分たちで対応する
更新の手順、バックアップの取り方、壊れたときの戻し方をまとめています。
2. いまの制作会社・保守業者に頼む
Ad Inserter – Ad Manager & AdSense Ads を使っているかどうかを含めて確認を依頼してください。 無料診断を実行すると、そのまま渡せる依頼文を作れます。
3. 相談先がない・自分では難しい
連絡が取れる相手がいない、管理画面に入れない、侵入された疑いがある。 そうした場合はご相談ください。
出典
- https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13018
- https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13022
- https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13025
- https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/ad-inserter.php#L13093
- https://plugins.trac.wordpress.org/browser/ad-inserter/tags/2.8.18/class.php#L3297
- https://plugins.trac.wordpress.org/changeset/3709957/ad-inserter/trunk/ad-inserter.php