---
id: CVE-2026-19807
title: >-
  The ByteCoreStack – MCP Connector for AI Tools plugin for WordPress is
  vulnerable to Privilege Escalation in all versions up to, and including, 1.2.3
  This is due to the `wp_update_user_meta` MCP tool in `execute_tool` gating
  writes solel…
summary: >-
  The ByteCoreStack – MCP Connector for AI Tools plugin for WordPress is
  vulnerable to Privilege Escalation in all versions up to, and including, 1.2.3
  This is due to the `wp_update_user_meta` MCP tool in `execute_tool` gating
  writes solel…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-269
vendor: bytecorestack
product: ByteCoreStack – MCP Connector for AI Tools
affected:
  - mcp_connector_for_ai_tools <= 1.2.3
published: '2026-10-01'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T08:16:51.390'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-19807'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.1.0/includes/MCP/Server.php#L2042
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.1.0/includes/MCP/Server.php#L2044
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.1.0/includes/MCP/Server.php#L2046
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.1.0/includes/MCP/Server.php#L332
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.1.0/includes/OAuth/Server.php#L122
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.2.0/includes/MCP/Server.php#L2042
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.2.0/includes/MCP/Server.php#L2044
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.2.0/includes/MCP/Server.php#L2046
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.2.0/includes/MCP/Server.php#L332
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/bcs-mcp-manager/tags/1.2.0/includes/OAuth/Server.php#L122
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset/3711908/bcs-mcp-manager/trunk/includes/MCP/Server.php
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&new=3711909%40bcs-mcp-manager%2Ftags%2F1.2.4&old=3711721%40bcs-mcp-manager%2Ftags%2F1.2.3
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/ac09bf3e-49cf-4f11-92ba-d1fbf6f587d7?source=cve
    label: security@wordfence.com
tags:
  - nvd
  - cve.org
ingestedAt: '2026-10-01T08:40:11.739Z'
---

## Overview

The ByteCoreStack – MCP Connector for AI Tools plugin for WordPress is vulnerable to Privilege Escalation in all versions up to, and including, 1.2.3 This is due to the `wp_update_user_meta` MCP tool in `execute_tool` gating writes solely with `current_user_can('edit_user', $uid)` — a check that WordPress core's `map_meta_cap` resolves to the `read` primitive when the target user ID matches the caller's own — while enforcing an incomplete meta key blocklist that covers only `user_pass`, `user_activation_key`, and `session_tokens`, leaving the `wp_capabilities` and `wp_user_level` meta keys entirely unprotected. This makes it possible for authenticated attackers with Subscriber-level access and above to elevate their privileges to Administrator by issuing a `wp_update_user_meta` call over the MCP JSON-RPC endpoint with `key=wp_capabilities` and an arbitrary role array such as `{'administrator': true}` targeting their own user ID, causing WordPress to load that account as an Administrator on the next request.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.