---
id: CVE-2026-18423
title: >-
  Concrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object
  reference (IDOR)  in the Express saved search preset delete and edit dialogs 
summary: >-
  Concrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object
  reference (IDOR)  in the Express saved search preset delete and edit dialogs .
  An authenticated user holding only view permission on a single Express entity
  could t…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H'
cwe:
  - CWE-639
vendor: concretecms
product: concrete_cms
affected:
  - 'concrete_cms >= 9.0.0, < 9.5.3'
patched:
  - concrete_cms 9.5.3
published: '2026-09-15'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:50:42.470'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-18423'
references:
  - url: >-
      https://documentation.concretecms.org/developers/introduction/version-history/953-release-notes
    label: ff5b8ace-8b95-4078-9743-eac1ca5451de
tags:
  - nvd
  - cve.org
  - score-dispute
epss: 0.00246
epssPercentile: 0.1418
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-15T19:42:54.758501Z'
scores:
  nvd: 7.1
  cna: 2.1
ingestedAt: '2026-09-15T19:42:58.817Z'
---

## Overview

Concrete CMS 9.0.0 through 9.5.2 is vulnerable to Insecure direct object reference (IDOR)  in the Express saved search preset delete and edit dialogs . An authenticated user holding only view permission on a single Express entity could therefore permanently delete, with no undo, or rename saved search presets owned by Express entities for which they had no permission, and a renamed preset name was displayed back to users of the targeted entity, enabling defacement or social engineering. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N. Thanks Yalguun Tumenkhuu ( fg0x0 ) for reporting.

## Affected

- `concrete_cms >= 9.0.0, < 9.5.3`

## Remediation

Upgrade past the affected range:

- `concrete_cms 9.5.3`