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CVE-2026-56721— CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController

Quick assessment

Affected
owen2345 CamaleonCMS
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Owen Peredo Diaz CamaleonCMS是Owen Peredo Diaz个人开发者的一款内容管理系统。 Owen Peredo Diaz CamaleonCMS 2.9.2及之前版本存在授权问题漏洞，该漏洞源于不安全的直接对象引用（IDOR），由于UsersController中授权过滤器与动作体之间的参数混淆，可能导致经过身份验证的低权限攻击者覆盖任意用户凭据（包括管理员密码），实现完全接管站点。

CVSS 8.8 · High EPSS 0.36% · P29

Affected Version Matrix 1

VendorProduct Version RangeStatus
owen2345 CamaleonCMS ≤ 2.9.2 affected
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I. Basic Information for CVE-2026-56721

Vulnerability Information
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Vulnerability Title
CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Owen Peredo Diaz CamaleonCMS 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Owen Peredo Diaz CamaleonCMS是Owen Peredo Diaz个人开发者的一款内容管理系统。 Owen Peredo Diaz CamaleonCMS 2.9.2及之前版本存在授权问题漏洞，该漏洞源于不安全的直接对象引用（IDOR），由于UsersController中授权过滤器与动作体之间的参数混淆，可能导致经过身份验证的低权限攻击者覆盖任意用户凭据（包括管理员密码），实现完全接管站点。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
owen2345 CamaleonCMS 0 ~ 2.9.2 -

II. Public POCs for CVE-2026-56721

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6357 chars
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III. Intelligence Information for CVE-2026-56721

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Patches & Fixes for CVE-2026-56721 (2)

Vendor Advisories for CVE-2026-56721 (1)

Other References for CVE-2026-56721 (1)

IV. Related Vulnerabilities

Same product: CamaleonCMS
Same vendor: owen2345
Same weakness: CWE-639

V. Comments for CVE-2026-56721

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