---
id: "CVE-2026-111958"
kind: "vulnerability"
aliases: ["CVE-2026-111958"]
title: "Royal MCP WordPress plugin: preview token grants full administrator access"
severity: "high"
cvss: 7.5
epss: 0.0019
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["mcp", "package", "self-hosted", "wordpress", "wordpress-plugin"]
not_affected_if: ["plugin-not-installed", "updated-to-1.5.7"]
published_at: "2026-10-22T06:17:14+00:00"
first_seen_at: "2026-10-23T21:57:30+00:00"
updated_at: "2026-10-25T03:16:15+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111958", "first_seen_at": "2026-10-23T21:57:30+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-111958", "first_seen_at": "2026-10-24T07:15:52+00:00"}]
---

# Royal MCP WordPress plugin: preview token grants full administrator access

The Royal MCP WordPress plugin before 1.5.7 does not restrict a preview-link token to the one preview it was issued for. Anyone holding a valid token is authenticated as the token's owner, typically an administrator, across the whole REST API, which allows full site takeover.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Royal MCP plugin version in the WordPress admin plugins list or with `wp plugin get royal-mcp --field=version` (version is unknown from sources; slug assumed)
- Confirm whether the site has the plugin active with `wp plugin is-active royal-mcp`

## Fix

- Update the Royal MCP plugin to `1.5.7` or later
- If the plugin cannot be updated, deactivate it until it is patched
- Rotate any preview-link tokens and administrator credentials if the site was exposed

## Timeline

- 2026-10-23T21:57:30+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111958
- 2026-10-24T07:15:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-111958

## From the sources

The Royal MCP  WordPress plugin before 1.5.7 does not limit a preview-link token to the single preview it was issued for, so any party that obtains a valid token is authenticated as the token's owning user, an administrator in the default configuration, across the entire REST API with no nonce, leading to full site takeover.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_