🛡️ CVE-2026-16774

🟡 CVSS 5.3 — Medium ✅ No Known Exploit CWE-862 NVD
5.3
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity low, availability none.

Weakness class

CVE-2026-16774 is classified as CWE-862: Missing Authorization. No authorisation check is performed before carrying out a restricted action.

Affected software

CVE-2026-16774 is recorded against 1 package.

  • unknown

Timeline and source

Published on 28 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

plugins.trac.wordpress.org
plugins.trac.wordpress.org
plugins.trac.wordpress.org
plugins.trac.wordpress.org
www.wordfence.com

Details

Severity MEDIUM
CVSS Score 5.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CWE CWE-862
Public Exploit ✅ No
Source NVD
Published 2026-07-28
Updated 2026-08-11
Modified 2026-07-28
Fix URL N/A

Affected Packages

Software From version Fixed in
unknown — —

Similar Threats

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