CVE-2026-18122Network attack vectorHinoki check available

Restricted-entry disclosure via disabled per-entry permission checks

Published Sep 11, 2026 · Updated Sep 11, 2026

Missing authorization in Concrete CMS 9.2.0 through 9.5.2 allows remote authenticated users to read restricted Express entries via REST API. The Express entry collection endpoint disables its per-entry view permission check before serializing entries and requested includes. A valid OAuth token with entity read scope is required; the response exposes identifiers, URLs, labels, dates, attributes, and associated entries denied to that user.

CVSS severity6.0
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Missing authorization in Concrete CMS 9.2.0 through 9.5.2 allows remote authenticated users to read restricted Express entries via REST API. The Express entry collection endpoint disables its per-entry view permission check before serializing entries and requested includes. A valid OAuth token with entity read scope is required; the response exposes identifiers, URLs, labels, dates, attributes, and associated entries denied to that user.

The record

CVE
CVE-2026-18122
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-862, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=9.2.0 <=9.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Concrete CMS · Concrete CMSversion=9.2.0 <=9.5.2

Published CVSS scores

6.0Concrete CMS Security TeamCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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