CVE-2026-56721
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
- Camaleon Cms
- Fix
- Available
- CVSS 3.1
- 8.8 HIGH
- EPSS
- 0.4% (29th percentile)
- Weakness
- CWE-639
- NVD status
- Received
- Published
- 2026-08-11
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