CVE-2026-103900

The WPJAM Basic plugin for WordPress is vulnerable to Privilege Escalation in versions up to, and including, 7.1 This is due to the WPJAM_User_Signup::signup() function unpacking attacker-supplied `data[args]` from the AJAX POST body and merging it via PHP array union into the payload passed to WPJAM_User::create(), whose internal whitelist (wpjam_pick) explicitly preserves the `role` key before it is handed to wp_insert_user(). The endpoint is registered as wp_ajax_nopriv_{provider}-signup with a nonce that is emitted on the public login page. This makes it possible for unauthenticated attackers to elevate their privileges to Administrator by creating a new user with an attacker-chosen role, provided a social-login provider is registered and open registration is enabled.

CWE: CWE-269 ／ 公開 2026年11月7日 ／ 最終更新 2026年11月7日

WPJAM Basic を 7.1.2 以降に更新してください。これで本脆弱性は解消します。

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