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

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

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 23 Jul 2026
- **Updated:** 23 Jul 2026
- **Also known as:** GHSA-8g44-6rrm-mf2w

## 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 (Missing Authorization)

## 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.

## 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:

- A WordPress plugin exposing an MCP server over the REST API, with the security model as the point -- closes the CVE-2026-15015 OAuth-bypass shape by never having that surface at all. (github_poc): https://github.com/les-k/wp-secure-mcp
- MountDev AI MCP Connector <= 1.6.1 - Unauthenticated Admin OAuth Token Exposure (nuclei): http/cves/2026/CVE-2026-15015.yaml

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15015 and fix it if it is affected.

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

Affected product: cascadiawebservices MountDev AI MCP Connector for WordPress. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-15015/ (Markdown: https://insights.sbomify.com/CVE-2026-15015/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15015
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15015
- OSV: https://osv.dev/vulnerability/CVE-2026-15015

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15015/
Summaries are generated and may contain mistakes; the official description above is the record.