CVE-2026-5478

The Everest Forms plugin for WordPress is vulnerable to Arbitrary File Read and Deletion in all versions up to, and including, 3.4.4. This is due to the plugin trusting attacker-controlled old_files data from public form submissions as legitimate server-side upload state, and converting attacker-supplied URLs into local filesystem paths using regex-based string replacement without canonicalization or directory boundary enforcement. This makes it possible for unauthenticated attackers to read arbitrary local files (e.g., wp-config.php) by injecting path-traversal payloads into the old_files upload field parameter, which are then attached to notification emails. The same path resolution is also used in the post-email cleanup routine, which calls unlink() on the resolved path, resulting in the targeted file being deleted after being attached. This can lead to full site compromise through disclosure of database credentials and authentication salts from wp-config.php, and denial of service through deletion of critical files. Prerequisite: The form must contain a file-upload or image-upload field, and disable storing entry information.

CWE: CWE-22 ／ 公開 2026年4月20日 ／ 最終更新 2026年6月17日

Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI を 3.4.5 以降に更新してください。これで本脆弱性は解消します。

Everest Forms – Contact Form, Payment Form, Quiz, Survey & Custom Form Builder with AI の他の脆弱性を見る →