owen2345 CamaleonCMS up to 2.9.2 Authorization Filter users_controller.rb updated_ajax id/user_id authorization

Summaryinfo

A vulnerability identified as critical has been detected in owen2345 CamaleonCMS up to 2.9.2. Affected by this vulnerability is the function updated_ajax of the file app/controllers/users_controller.rb of the component Authorization Filter. This manipulation of the argument id/user_id causes authorization. This vulnerability is handled as CVE-2026-56721. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in owen2345 CamaleonCMS up to 2.9.2 and classified as critical. Affected by this vulnerability is the function updated_ajax of the file app/controllers/users_controller.rb of the component Authorization Filter. The manipulation of the argument id/user_id with an unknown input leads to a authorization vulnerability. The CWE definition for the vulnerability is CWE-639. The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-56721 since 06/22/2026. The exploitation appears to be easy. The attack can be launched remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/11/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• owen2345

Name

• CamaleonCMS

Version

• 2.9.0
• 2.9.1
• 2.9.2

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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