CVE-2026-86777Public exploitNetwork attack vector

Unauthenticated metadata disclosure via unguarded nodes index

Published Sep 9, 2026 · Updated Sep 9, 2026

Missing authorization in Alchemy CMS before 7.4.16 and 8.0.0 through 8.3.5 allows remote attackers to disclose navigation metadata. Alchemy::Api::NodesController#index queries Node.all without accessible_by or authorize!, then serializes nodes across every site and language. No authentication or user interaction is required; exposure is limited to restricted or draft page names, URL paths, internal menu URLs, and navigation structure rather than page content.

CVSS severity6.9
Medium
EPSS probability0.41%
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 Alchemy CMS before 7.4.16 and 8.0.0 through 8.3.5 allows remote attackers to disclose navigation metadata. Alchemy::Api::NodesController#index queries Node.all without accessible_by or authorize!, then serializes nodes across every site and language. No authentication or user interaction is required; exposure is limited to restricted or draft page names, URL paths, internal menu URLs, and navigation structure rather than page content.

The record

CVE
CVE-2026-86777
Published
Sep 9, 2026
Updated
Sep 9, 2026
Vendor
AlchemyCMS
Product
Alchemy CMS
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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=0 <7.4.16
  2. Affected versionversion=8.0.0 <8.3.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AlchemyCMS · Alchemy CMSversion=0 <7.4.16; version=8.0.0 <8.3.6

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA: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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

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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