CVE-2026-10750: Royal MCP WordPress Plugin Privilege Escalation – Patch Now

Technical summary

CVE-2026-10750 stems from inadequate capability checking in the Royal MCP plugin's MCP tool handlers. The plugin authenticates users via token but fails to enforce WordPress capability checks on the majority of its MCP tools post-authentication. This allows privilege escalation: an authenticated user with minimal privileges (e.g., Subscriber role) can invoke operations that should be restricted to higher-privilege roles such as Editor or Administrator. The CVSS 3.1 vector (8.1/HIGH) reflects network exploitability, low attack complexity, low privileges required, and high impact to both confidentiality and integrity. The absence of availability impact suggests data exfiltration and manipulation rather than denial-of-service potential.

Business impact

An attacker with even guest-level WordPress access can compromise site confidentiality and integrity at scale. Private content—drafts, unpublished articles, sensitive pages—becomes readable. User enumeration coupled with role disclosure accelerates targeted attacks. Content modification or deletion by unauthorized users risks data loss, website defacement, and operational disruption. For multi-author or client-facing WordPress installations, this could expose client data or allow sabotage across multiple content streams. Affected organizations may face compliance violations (GDPR, HIPAA) if private user or client data is exposed.

Affected systems

Royal MCP WordPress plugin versions below 1.4.26 are affected. The vulnerability requires an active WordPress installation with the plugin enabled and an attacker having a valid WordPress user account (subscriber level or higher). No information on affected product versions beyond the plugin is provided in the source data; verify your plugin version in wp-content/plugins/ and consult the Royal MCP vendor advisory for any dependencies or related products.

Exploitability

Exploitability is high in environments where WordPress sites permit user registration (common for blogs and community sites) or where internal users have basic site access. An attacker can leverage this vulnerability immediately upon gaining any WordPress credential, including through credential stuffing, compromised supplier accounts, or simple account registration if the site permits it. No special tooling is required—any MCP tool invocation post-authentication bypasses the intended capability gate. However, the attacker must already possess a valid WordPress login; unauthenticated attacks are not possible.

Remediation

Update Royal MCP to version 1.4.26 or later without delay. This is a high-severity privilege-escalation vulnerability affecting any multi-user WordPress installation. After updating, verify plugin activation and test that low-privileged user roles cannot access restricted MCP tools. Consider temporarily disabling the plugin if an immediate update is not feasible, though this will impact any functionality dependent on Royal MCP.

Patch guidance

Verify the current installed version of Royal MCP via the WordPress admin dashboard (Plugins > Installed Plugins). Update to version 1.4.26 or later through the standard WordPress plugin update mechanism or by downloading the latest release from the official Royal MCP distribution channel. After patching, restart WordPress and confirm plugin status. If your WordPress instance does not automatically fetch updates, manually verify that the new version is active and test basic MCP tool operations with a low-privileged test account to confirm capability restrictions are enforced.

Detection guidance

Monitor WordPress debug logs and MCP tool audit trails for MCP tool invocations by low-privileged users (Subscriber, Contributor roles). Spike detection on content queries or user enumeration by accounts that should not have such access is a strong indicator of exploitation. Review WordPress user activity logs for unauthorized content modifications or deletions. If logging is not available, implement post-patch audit logging and conduct a content integrity scan to identify any unauthorized changes or deletions that may have occurred prior to patching.

Why prioritize this

This vulnerability rates HIGH priority (CVSS 8.1) due to its ease of exploitation (low attack complexity, low privileges required), broad attack surface (any authenticated user), and significant impact (confidentiality and integrity compromise). Multi-user WordPress sites, particularly those with community features or internal user bases, face immediate risk. The lack of KEV listing does not diminish urgency; organizations should treat this as critical for their specific environment if they run Royal MCP. Patch immediately.

Risk score, explained

The CVSS 3.1 score of 8.1/HIGH reflects: (1) network-accessible attack vector (AV:N), (2) low attack complexity requiring only valid credentials (AC:L), (3) low privilege requirement (PR:L), (4) high confidentiality impact via user and content enumeration (C:H), and (5) high integrity impact via unauthorized content modification/deletion (I:H). No availability impact (A:N) is scored because the vulnerability does not directly disrupt service. The high score underscores the ease and scope of potential harm once credentials are obtained.

Frequently asked questions