---
id: CVE-2026-56721
title: >-
  CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in
  UsersController
summary: >-
  CamaleonCMS version 2.9.2 and earlier contains a privilege escalation
  vulnerability via insecure direct object reference (IDOR) that allows
  authenticated low-privileged attackers to overwrite any user's credentials by
  exploiting a parame…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-639
vendor: owen2345
product: CamaleonCMS
affected:
  - CamaleonCMS <= 2.9.2
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-08-11T17:44:18.998747Z'
published: '2026-08-11'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T16:47:54.211Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-56721'
references:
  - url: 'https://github.com/owen2345/camaleon-cms'
    label: Product Repository
  - url: 'https://github.com/owen2345/camaleon-cms/pull/1185'
    label: Pull Request
  - url: >-
      https://github.com/owen2345/camaleon-cms/commit/26345034523a505cb01615509b7f0a665e89ae3e
    label: Patch Commit
  - url: >-
      https://www.vulncheck.com/advisories/camaleoncms-privilege-escalation-via-parameter-confusion-in-userscontroller
tags:
  - cve.org
epss: 0.00523
epssPercentile: 0.44519
ingestedAt: '2026-10-26T17:33:33.065Z'
---

## Overview

CamaleonCMS version 2.9.2 and earlier contains a privilege escalation vulnerability via insecure direct object reference (IDOR) that allows authenticated low-privileged attackers to overwrite any user's credentials by exploiting a parameter confusion flaw between the authorization filter and action body in the UsersController. Attackers can send a PATCH request to the updated_ajax endpoint setting params[:id] to their own user ID to pass the self-authorization check while simultaneously setting params[:user_id] to a victim's ID, causing the controller to load and mutate the victim's account, including overwriting administrator passwords to achieve full site takeover.

## Affected

- `CamaleonCMS <= 2.9.2`

## Remediation

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