Description
The Chatbot plugin for WordPress is vulnerable to Missing Authorization in versions up to, and including, 8.5.9 via the wpcs_send_email() AJAX handler. This is due to the wpcs_send_email() function being registered on both wp_ajax_wpcs_send_email and wp_ajax_nopriv_wpcs_send_email with no nonce verification, capability check, or rate limiting, while forwarding attacker-controlled recipient, subject, and body directly to wp_mail(). This makes it possible for unauthenticated attackers to send arbitrary emails to any recipient from the site's domain, enabling spam, phishing, and abuse that can lead to the site's IP/domain being blacklisted.
References5
- plugins.trac.wordpress.org/browser/chatbot/tags/8.5.9/includes/…
- plugins.trac.wordpress.org/browser/chatbot/tags/8.5.9/includes/…
- plugins.trac.wordpress.org/browser/chatbot/tags/8.5.9/includes/…
- plugins.trac.wordpress.org/changeset?reponame=&old=3621386%40ch…
- www.wordfence.com/threat-intel/vulnerabilities/id/3cc6aa06-ab2a…
Metrics
- CVSS 3.1
-
5.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - EPSS — exploit probability
- 0% percentile: 35 · as of 13 November 2026
- CWE
- CWE-862
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.