CVE-2026-86777

Deferred Deferred - Pending Action

AlchemyCMS Unauthorized Node Disclosure via API

Publication date: 2026-09-09

Last updated on: 2026-09-09

Assigner: VulnCheck

Description

AlchemyCMS versions before 7.4.16 and 8.x before 8.3.6 fail to authorize access to the GET /api/nodes endpoint, allowing unauthenticated attackers to retrieve all navigation nodes. Attackers can access the endpoint without authentication to disclose restricted page names, URL paths, and internal URLs from all sites and languages.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-09-09

Last Modified

2026-09-09

Generated

2026-09-29

AI Q&A

2026-09-10

EPSS Evaluated

2026-09-27

NVD

CVE-2026-86777

EUVD

EUVD-2026-74789

Affected Vendors & Products

Vendor	Product	Version / Range
alchemycms	alchemycms	to 7.4.16 (exc)
alchemycms	alchemycms	to 8.3.6 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

This vulnerability affects AlchemyCMS versions before 7.4.16 and 8.x before 8.3.6. It involves a missing authorization check on the GET /api/nodes endpoint, allowing unauthenticated attackers to retrieve all navigation nodes. This exposes restricted page names, URL paths, and internal URLs across all sites and languages.

Detection Guidance

To detect this vulnerability, check if your AlchemyCMS version is below 7.4.16 or 8.x below 8.3.6. Use curl to test the endpoint: curl -i http://your-server.com/api/nodes. If the response includes navigation nodes without authentication, the system is vulnerable.

Impact Analysis

An attacker could exploit this to gather sensitive information about your site structure, including unpublished or restricted pages. This may aid further attacks like phishing or unauthorized access. The impact is primarily on confidentiality as it exposes metadata rather than content.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA by exposing sensitive data about site structure, including restricted pages. Unauthorized disclosure of such information may violate data protection requirements for confidentiality and access controls.

Mitigation Strategies

Upgrade AlchemyCMS to version 7.4.16 or 8.3.6 or later. Apply the authorization fix by ensuring the nodes#index action enforces access controls similar to other API endpoints. Restrict access to the /api/nodes endpoint until patched.

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