---
id: CVE-2026-68527
title: >-
  Concrete CMS 8.3.0 through 9.5.2 is vulnerable to an authorization bypass
  through user-controlled key (cross-calendar IDOR) in the Calendar event edit
  dialog
summary: >-
  Concrete CMS versions 8.3.0 through 9.5.2 are vulnerable to an authorization
  bypass in the Calendar event edit dialog
  (concrete/controllers/dialog/event/edit.php). The dialog checked permissions
  against the calendar identifier supplied i…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: Concrete CMS
product: Concrete CMS
affected:
  - concrete_cms >= 8.3.0 <= 9.5.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T18:28:53.646967Z'
published: '2026-09-10'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T18:29:04.125Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-68527'
references:
  - url: >-
      https://documentation.concretecms.org/9-x/developers/introduction/version-history/953-release-notes
tags:
  - cve.org
epss: 0.00468
epssPercentile: 0.37974
ingestedAt: '2026-09-11T16:45:48.027Z'
---

## Overview

Concrete CMS versions 8.3.0 through 9.5.2 are vulnerable to an authorization bypass in the Calendar event edit dialog (concrete/controllers/dialog/event/edit.php). The dialog checked permissions against the calendar identifier supplied in the request rather than the calendar owning the targeted event occurrence. A user with the "Add Event" permission on a single calendar could read and overwrite events on calendars they were not permitted to access, and could delete an event's original local occurrence. Publishing the injected version to the live calendar, which demotes the previously approved version, additionally required the actor's approve_calendar_event workflow rights or an auto-approving workflow. The Concrete CMS Security Team gave this a rank of 5.9 with CVSS 4.0 vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:H/VA:L/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

## Affected

- `concrete_cms >= 8.3.0 <= 9.5.2`

## Remediation

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