CVE-2026-56721Network attack vector

Account takeover via conflicting user identifiers

Published Aug 11, 2026 · Updated Aug 11, 2026

Authorization bypass in Camaleon CMS 2.9.2 and earlier allows remote authenticated users to overwrite another user's credentials. The UsersController authorizes params[:id], but updated_ajax loads the account from params[:user_id], so one request is checked against one user and applied to another. A low-privileged account can reset an administrator password and take control of the site without victim interaction.

CVSS severity8.7
High
EPSS probability0.36%
Next 30 days · Sep 17, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Camaleon CMS 2.9.2 and earlier allows remote authenticated users to overwrite another user's credentials. The UsersController authorizes params[:id], but updated_ajax loads the account from params[:user_id], so one request is checked against one user and applied to another. A low-privileged account can reset an administrator password and take control of the site without victim interaction.

The record

CVE
CVE-2026-56721
Published
Aug 11, 2026
Updated
Aug 11, 2026
Vendor
Camaleon CMS
Product
Camaleon CMS
Classifications
CWE-639, T1068
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.9.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Camaleon CMS · Camaleon CMSversion=0 <=2.9.2

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 11, 2026Sep 17, 2026
Latest reporting daySep 17, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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