MountDev AI MCP Connector for WordPress - Authorization Bypass (CVE-2026-15015)
Description
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.
psychologyCrowdSec Analysis
CVE-2026-15015 is a critical authorization bypass in the MountDev AI MCP Connector for WordPress, affecting versions up to and including 1.6.1. Unauthenticated attackers can exploit the plugin’s OAuth endpoints to obtain an administrator-bound bearer token, potentially gaining administrator-equivalent access to exposed WordPress content, users, options, and MCP tools.
CrowdSec has been tracking this vulnerability and its exploits since 21st of October 2026.
CrowdSec has not observed any significant exploitation activity targeting CVE-2026-15015 across its network. As a result, no community-driven trend analysis is available for this vulnerability at this time.
Attackers target /mcp-register to register an OAuth client, then use /wp-json/mountdev-ai-mcp-connector/v1/oauth/authorize and /mcp-token to obtain an administrator-bound Bearer token without authentication.
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| Event | Date |
|---|---|
| CVE Published | 2026-07-23 |
| Rule Released | 2026-10-21 |