CVE-2026-39490
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 · uneditedUnauthenticated Broken Access Control in JupiterX Core <= 4.14.1 versions.
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 confidenceUnauthenticated broken access control vulnerability in JupiterX Core WordPress plugin versions 4.14.1 and below allows unauthenticated attackers to access functionality or data that should require proper authorization, likely due to missing capability checks or insecure direct object references in plugin endpoints.
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
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- None
- Availability
- None
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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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Locate JupiterX Core plugin versionIn WordPress admin, go to Plugins > Installed Plugins, find JupiterX Core, and note the version number displayed. Alternatively, check the plugin's main PHP file header or the readme.txt file in the plugin directory for the Version field.Affected if The version listed is 4.14.1 or any earlier version (e.g., 4.14.0, 4.13.x, etc.).
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Identify plugin endpointsReview the JupiterX Core plugin directory (wp-content/plugins/jupiterx-core) for PHP files that register REST API routes or admin-ajax.php actions. Look for files in the 'api' or 'controllers' folders, or any file containing 'register_rest_route' or 'add_action' hooks accepting 'nopriv' capability.Affected if The plugin registers any REST API endpoints or AJAX actions that do not include capability checks (such as checking 'manage_options' or 'edit_posts' capability) and are accessible to unauthenticated users.
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Test for unauthenticated endpoint accessUsing a tool like curl or Burp Suite, send a request to suspected JupiterX Core endpoints without providing authentication credentials. Common paths include /wp-json/jupiterx/v1/* or any admin-ajax.php?action=jupiterx* requests. Check if the server returns successful data or performs actions instead of returning a 401/403 error.Affected if The server returns successful HTTP responses (200 OK) with data or performs actions without requiring any authentication token or session cookie.
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Verify authorization logic in plugin codeOpen the identified endpoint handler files and search for capability verification functions such as 'current_user_can', 'check_admin_referer', or 'wp_verify_nonce'. Examine whether these checks exist before executing sensitive functionality.Affected if Endpoint handlers lack capability checks entirely, or the checks are present but easily bypassed (e.g., missing nonce validation for state-changing operations).
Your environment is affected if JupiterX Core plugin version 4.14.1 or below is installed AND unauthenticated access to plugin functionality is possible due to missing or insufficient authorization checks on its endpoints.
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 JupiterX Core plugin to the latest version (beyond 4.14.1) to apply vendor patches for access control validation, and verify that no unauthorized access occurs after the update.
- Consultation2.0 h
- Implementation2.0 h
- Testing3.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,512.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-39490 — 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-2026-39490 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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- 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