High 7.5Published Oct 30, 2026

CVE-2026-110732AI Engine – The Chatbot, AI Framework & MCP for WordPress <= 3.8.6 - Missing Authorization to Administrator Account Takeover via Unauthenticated MCP OAuth Client Registration

Updated under an hour ago (Oct 30, 2026, 4:40 AM ET)

Does this affect you?

It affects tigroumeow AI Engine – MCP Server & AI Chatbot for WordPress, with Claude, ChatGPT & Gemini. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stackFree account, 3 products Every CVE for tigroumeow AI Engine – MCP Server & AI Chatbot for WordPress, with Claude, ChatGPT & Gemini Exploited in the last 30 days

The AI Engine – The Chatbot, AI Framework & MCP for WordPress plugin for WordPress is vulnerable to Missing Authorization in all versions up to, and including, 3.8.6 This is due to the MCP module's OAuth 2.1 Dynamic Client Registration endpoint (/wp-json/mcp/v1/oauth/register) being registered with a permission_callback of __return_true, allowing an unauthenticated user to register an active OAuth client with an attacker-controlled redirect URI. This makes it possible for unauthenticated attackers to obtain an administrator-bound MCP access token, and thereby full administrator-level control through the MCP tools (including user creation and option updates), once an administrator approves the attacker's client on the OAuth consent screen. The consent page is additionally served without X-Frame-Options or Content-Security-Policy frame-ancestors, so that approval can be obtained via clickjacking.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-862
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Wordfence
NVD analysis: Received
Record last updated: Oct 30, 2026
First seen by InfoSec Signals: Oct 30, 2026

Affected products

Affected products

tigroumeow AI Engine – MCP Server & AI Chatbot for WordPress, with Claude, ChatGPT & Gemini tigroumeow:ai_engine_mcp_server_and_ai_chatbot_for_wordpress_with_claude_chatgpt_and_gemini (from the name)	through 3.8.6	CNA record

References

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/eb115a8a-35f8-426f-bb67-4a523f67cb34?source=cve
https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php#L1159
https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php#L496
https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php#L317
https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php#L609
https://plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp.php#L232
https://plugins.trac.wordpress.org/changeset?reponame=&new=3760852%40ai-engine%2Ftags%2F3.8.7&old=3757660%40ai-engine%2Ftags%2F3.8.6
https://plugins.trac.wordpress.org/changeset/3760851/ai-engine/trunk/labs/mcp-oauth.php

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.