WPBot <= 8.5.9 - Missing Authorization to Unauthenticated Email Relay via wpcs_send_email AJAX Action
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-862.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| quantumcloud | WPBot – AI ChatBot for Live Support, Lead Generation, AI Services | up to 8.5.9 | — | No fix listed | CNA |
- WPBot – AI ChatBot for Live Support, Lead Generation, AI Services Vendorquantumcloud Affected up to 8.5.9 Fixed in — No fix listed CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:quantumcloud:wpbot:*:*:*:*:*:*:*:* | — | — | quantumcloud |
- cpe:2.3:a:quantumcloud:wpbot:*:*:*:*:*:*:*:* Versions — — ·quantumcloud
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2026-16774
- 2026-10-03 Alias added: GHSA-3fg6-68w4-pm87
References
Other 5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/3cc6aa06-ab2a-4d5c-bbbe-4c19722ccc53?source=cve
- https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.9/includes/chat-sessions/wpbot-chat-sessions.php#L494
- https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.9/includes/chat-sessions/wpbot-chat-sessions.php#L483
- https://plugins.trac.wordpress.org/browser/chatbot/tags/8.5.9/includes/chat-sessions/wpbot-chat-sessions.php#L478
- https://plugins.trac.wordpress.org/changeset?reponame=&old=3621386%40chatbot&new=3621386%40chatbot
More quantumcloud vulnerabilities
- TI-2024-06312 Simple Video Directory < 1.4.3 - Unauthenticated SQLi CVSS 3.1CRITICAL 9.8
- TI-2023-01552 ChatBot < 4.4.7 - Unauthenticated PHP Object Injection CVSS 3.1CRITICAL 9.8
- TI-2024-05388 Simple Video Directory < 1.4.4 - Contributor+ Stored XSS CVSS 3.1MEDIUM 6.1
- TI-2023-01558 ChatBot < 4.4.9 - Unauthenticated Stored XSS CVSS 3.1MEDIUM 6.1
- TI-2023-00958 ChatBot < 4.4.5 - Stored XSS via CSRF CVSS 3.1MEDIUM 6.1
- TI-2023-01553 ChatBot < 4.4.9 - Subscriber+ OpenAI Settings Update to Stored XSS CVSS 3.1MEDIUM 5.4
Sources
- CVE-2026-16774 · CVE Program
- CVE-2026-16774 · NVD
- FIRST EPSS
- GHSA-3fg6-68w4-pm87 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences