CVE-2026-15015 Auth bypass in MountDev AI MCP Connector for WordPress

Critical 9.8 Published 23 Jul 2026 Updated 23 Jul 2026

Unauthenticated attackers can escalate privileges to administrator by exploiting OAuth authorization flaws in the MountDev AI MCP Connector plugin.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-15015?

CVE-2026-15015 is a critical authentication bypass vulnerability in cascadiawebservices MountDev AI MCP Connector for WordPress, published on 23 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-862

Which versions are affected by CVE-2026-15015?

How do I fix CVE-2026-15015?

No fix has been published for CVE-2026-15015 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-15015 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15015 exists.

Public exploit code: 1 Nuclei template and 1 proofs of concept on GitHub.

Sources

Also known as GHSA-8g44-6rrm-mf2w.