---
id: CVE-2026-18122
title: >-
  Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted
  Express entries via Missing Authorization; the Concrete CMS REST API's Express
  entry collection endpoint disabled the per-entry view permission check
summary: >-
  Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted
  Express entries via Missing Authorization; the Concrete CMS REST API's Express
  entry collection endpoint disabled the per-entry view permission check. An
  OAuth…
severity: medium
cvss: 6
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N'
cwe:
  - CWE-862
vendor: Concrete CMS
product: Concrete CMS
affected:
  - concrete_cms >= 9.2.0 <= 9.5.2
published: '2026-09-11'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T20:17:12.873'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18122'
references:
  - url: >-
      https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes
    label: ff5b8ace-8b95-4078-9743-eac1ca5451de
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-11T19:23:04.479456Z'
cvssSource: cna
ingestedAt: '2026-09-14T15:13:07.230Z'
epss: 0.00232
epssPercentile: 0.12617
---

## Overview

Concrete CMS 9.2.0 to 9.5.2 Express REST API list endpoint exposes restricted Express entries via Missing Authorization; the Concrete CMS REST API's Express entry collection endpoint disabled the per-entry view permission check. An OAuth token with read scope for an Express entity could enumerate entries that its user context lacked permission to view, disclosing each entry's public identifier, URL, label, dates, and any attribute or associated-entry data requested via the includes parameter. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 6.0 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks riodrwn for reporting.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.