AI Engine – The Chatbot, AI Framework & MCP for WordPress <= 3.8.6 - Missing Authorization to Administrator Account Takeover via Unauthenticated MCP OAuth Client Registration
Summary
| CVE | CVE-2026-110732 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-10-30 07:16:31 UTC |
| Updated | 2026-10-30 07:16:31 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.5 HIGH from [email protected]
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Primary | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| 3.1 | CNA | DECLARED | 7.5 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
HighCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Tigroumeow | AI Engine MCP Server AI Chatbot For WordPress With Claude ChatGPT Gemini | affected 3.8.6 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/changeset | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/eb115a8a-35f8-426f-bb67-4a523... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/changeset/3760851/ai-engine/trunk/labs/mcp-oauth.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/ai-engine/tags/3.8.3/labs/mcp-oauth.php | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: satoshigpt2021-sketch (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-10-14T15:37:28.000Z | Vendor Notified |
| CNA | 2026-10-29T18:00:34.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.