Vulnerability · Published Aug 11, 2026 · Assigned by VulnCheck
CVE-2026-56721CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController
High 8.8
In plain English
A high-severity authorization bypass via user-controlled key in CamaleonCMS from owen2345. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| owen2345 | CamaleonCMS | 0 – through 2.9.2 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- Product Repository product
- Pull Request issue-tracking
- Patch Commit patch
- https://www.vulncheck.com/advisories/camaleoncms-privilege-escalation-via-parameter-confusion-in-userscontroller third-party-advisory