CVE-2026-16774 | The Chatbot plugin for WordPress is vulnerable to Missing Au… | CVSS 5.3 MEDIUM

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.

Metadata

CVE ID: CVE-2026-16774
State: PUBLISHED
Assigner: Wordfence
Reserved: 2026-07-23 17:09 UTC
Published: 2026-07-28 11:32 UTC
Last updated: 2026-07-28 14:53 UTC
Primary CWE: CWE-862
CWE-862 Missing Authorization
Vendor / Product: quantumcloud / WPBot – AI ChatBot for Live Support, Lead Generation, AI Services
Sources: cve.org · NVD

Severity & Metrics

5.3 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
quantumcloud	WPBot – AI ChatBot for Live Support, Lead Generation, AI Services	—	0 ≤ 8.5.9

Weakness (CWE)

CWE	Source	Description
CWE-862	cna	CWE-862 Missing Authorization

CVSS scores (1)

Score	Severity	Version	Source	Vector
5.3	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References (5)