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Vulnerability · Published Oct 30, 2026 · Assigned by Wordfence

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

High 7.5

In plain English

A high-severity missing authorization in AI Engine – MCP Server & AI Chatbot for WordPress, with Claude, ChatGPT & Gemini from tigroumeow. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.3%top 80.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

VendorProductVersions
tigroumeow AI Engine – MCP Server & AI Chatbot for WordPress, with Claude, ChatGPT & Gemini 0 – through 3.8.6

Weakness: CWE-862 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References