CVE-2026-16774 WPBot <= 8.5.9 - Missing Authorization to Unauthenticated Email Relay via wpcs_send_email AJAX Action
Unauthenticated attackers can send arbitrary emails via the WPBot plugin, enabling spam and phishing that may blacklist the site's domain.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16774?
CVE-2026-16774 is a medium-severity missing authorization vulnerability in quantumcloud WPBot – AI ChatBot for Live Support, Lead Generation, AI Services, published on 28 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-862
Which versions are affected by CVE-2026-16774?
How do I fix CVE-2026-16774?
No fix has been published for CVE-2026-16774 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-16774 being exploited?
There is no known exploitation of CVE-2026-16774 in the wild and no public exploit code.
Sources
Also known as GHSA-3fg6-68w4-pm87.