CVE-2026-54842Network attack vector

Subscriber privilege escalation via unchecked MCP tools

Published Jun 25, 2026 · Updated Jun 25, 2026

Missing authorization in Royal MCP 1.4.25 and earlier allows remote authenticated users to invoke MCP tools beyond their WordPress role. The MCP dispatcher authenticates OAuth sessions but fails to enforce each tool's required WordPress capability before calling content, user, term, comment, and integration handlers. Subscriber-level credentials are sufficient to perform unauthorized reads and changes to site data through affected tools.

CVSS severity8.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Royal MCP 1.4.25 and earlier allows remote authenticated users to invoke MCP tools beyond their WordPress role. The MCP dispatcher authenticates OAuth sessions but fails to enforce each tool's required WordPress capability before calling content, user, term, comment, and integration handlers. Subscriber-level credentials are sufficient to perform unauthorized reads and changes to site data through affected tools.

The record

CVE
CVE-2026-54842
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
Royal Plugins
Product
Royal MCP
Classifications
CWE-862, CAPEC-180, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=n/a <=1.4.25 changes=[{"at":"1.4.26","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Royal Plugins · Royal MCPversion=n/a <=1.4.25 changes=[{"at":"1.4.26","status":"unaffected"}]

Published CVSS scores

8.1PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
CAPEC-180Exploiting Incorrectly Configured Access Control Security Levels
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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