EUVD-2026-47907
GHSA-8g44-6rrm-mf2w
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Unauthenticated network chain (PR:N/UI:N/AC:L) yields an admin-bound token granting full read/write over all site data, so C/I/A all High.
Primary rating from Vendor (wordfence).
CVSS VectorVendor: wordfence
Lifecycle Timeline
2DescriptionCVE.org
The MountDev AI MCP Connector for WordPress plugin for WordPress is vulnerable to authorization bypass in all versions up to, and including, 1.6.1. This is due to the plugin not properly verifying that a user is authorized to perform an action. This makes it possible for unauthenticated attackers to obtain an administrator-bound OAuth Bearer token via a self-registered client, granting full administrator-equivalent access to the plugin's MCP tool surface and all exposed WordPress content, users, and options. This is exploitable by combining the publicly accessible Dynamic Client Registration endpoint, which allows unauthenticated callers to register arbitrary OAuth clients with an attacker-controlled redirect_uri, with the unprotected authorization endpoint to complete the full OAuth flow without any administrator interaction.
Articles & Coverage 1
AnalysisAI
Authorization bypass in the MountDev AI MCP Connector for WordPress plugin (all versions ≤ 1.6.1) lets unauthenticated attackers mint an administrator-bound OAuth Bearer token by abusing an open Dynamic Client Registration endpoint together with an unprotected authorization endpoint, yielding full admin-equivalent control over the plugin's MCP tool surface and all exposed WordPress content, users, and options. Because the flaw is network-reachable with no privileges or user interaction (CVSS 9.8), it effectively grants site takeover. Currently there is no public exploit identified at time of analysis and the issue is not in CISA KEV, but Wordfence has published a detailed threat-intel entry.
Technical ContextAI
The plugin implements an OAuth 2.0 / Model Context Protocol (MCP) authorization server inside WordPress to broker AI agent access to site data. The vulnerability class is CWE-862 (Missing Authorization): the OAuth controller (includes/class-oauth-controller.php, per the referenced trac lines 188/370/474/571) exposes a Dynamic Client Registration endpoint (RFC 7591) that any unauthenticated caller can hit to register an arbitrary client with an attacker-chosen redirect_uri, and pairs it with an authorization endpoint that never verifies that the requesting party is an authenticated, consenting administrator. The token issued is bound to an administrator identity, so the resulting Bearer token confers administrator-equivalent scope across the MCP tool surface (WordPress content, users, and options).
RemediationAI
Upgrade the MountDev AI MCP Connector plugin to a version later than 1.6.1 (the fix is reflected in the WordPress.org trac changeset referenced above; an exact patched release version is not stated in the input, so confirm the fixed version on the plugin's WordPress.org page before deploying - Upstream fix available per the trac changeset, released patched version not independently confirmed here). If you cannot patch immediately, deactivate and remove the plugin, since the vulnerable OAuth endpoints are the plugin's core function and cannot be safely left enabled. As compensating controls, block or restrict external access to the plugin's OAuth REST routes (the Dynamic Client Registration and authorization endpoints) at the WAF or web-server layer, and use a Wordfence firewall rule if available; note the trade-off that blocking these routes disables legitimate MCP/AI agent connectivity. Review existing WordPress users, application passwords, and registered OAuth clients for rogue entries created via the registration endpoint, and rotate secrets. Consult the Wordfence advisory at https://www.wordfence.com/threat-intel/vulnerabilities/id/ce8ec66f-5efc-4354-8871-8e35ab4e51fc?source=cve for detection guidance.
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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