CVE-2026-54842
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedMissing Authorization vulnerability in Royal Plugins Royal MCP allows Exploiting Incorrectly Configured Access Control Security Levels. This issue affects Royal MCP: from n/a through 1.4.25.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceMissing authorization vulnerability in Royal Plugins Royal MCP allows attackers to bypass access control checks due to incorrectly configured security levels. The plugin fails to properly verify user permissions before allowing access to certain functionality, potentially enabling unauthorized users to access sensitive features or data.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Confirm Royal MCP plugin installationCheck your WordPress or CMS plugin directory for the Royal MCP plugin folder, or query your system's plugin listAffected if The Royal MCP plugin is installed and active
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Identify installed Royal MCP versionView the plugin's main file header (typically royal-mcp.php or similar) to read the Version field, or use the admin panel plugin listAffected if The installed version cannot be determined or falls within any vulnerable version range (contact vendor for specifics)
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Review access control configurationExamine the plugin's configuration files and settings panel for security level settings, particularly any role-based access control (RBAC) or permission settingsAffected if Security levels are set to a permissive mode or misconfigured such that non-admin users can access admin-level functions
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Test endpoint access without authorizationUsing a low-privilege or unauthenticated test account, attempt to access known Royal MCP API endpoints or administrative functions that should require elevated privilegesAffected if Access is granted without proper permission verification, indicating the authorization bypass is present
Your environment is affected if the Royal MCP plugin is installed with any security level misconfiguration that allows unauthorized access to protected features or data.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUpdate Royal MCP to the latest version and conduct a security review of all access control configurations to ensure proper authorization checks are enforced on all sensitive endpoints and functions.
- Consultation4.0 h
- Implementation6.0 h
- Testing3.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $4,592.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-54842 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-54842 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.
- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
- No spam, self-promotion, credentials, or personal data