{"id":"CVE-2026-56721","summary":"CamaleonCMS 2.9.2 Privilege Escalation via Parameter Confusion in UsersController","details":"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.","modified":"2026-08-15T04:07:24.106738663Z","published":"2026-08-11T15:48:59.409Z","database_specific":{"cwe_ids":["CWE-639"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56721.json","cna_assigner":"VulnCheck"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/56xxx/CVE-2026-56721.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56721"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/camaleoncms-privilege-escalation-via-parameter-confusion-in-userscontroller"},{"type":"REPORT","url":"https://github.com/owen2345/camaleon-cms/pull/1185"},{"type":"FIX","url":"https://github.com/owen2345/camaleon-cms/commit/26345034523a505cb01615509b7f0a665e89ae3e"},{"type":"PACKAGE","url":"https://github.com/owen2345/camaleon-cms"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/owen2345/camaleon-cms","events":[{"introduced":"0"},{"fixed":"26345034523a505cb01615509b7f0a665e89ae3e"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"last_affected":"2.9.2"}]}}],"versions":["2.9.2","2.9.1","2.9.0","2.8.3","2.8.2","2.8.1","2.8.0","2.7.5","2.7.4","2.7.3","2.7.1","2.7.0","2.6.4","2.6.2","2.6.1","2.6.0.1","2.6.0","2.5.3.1","2.5.3","2.5.1","2.4.6.7","2.4.6.1","2.4.6.0","2.4.5.14","2.4.5.13","2.4.5.12","camaleon_cms-2.4.5.11.gem","2.4.5.11","2.4.5.10","2.4.5.7","2.4.5.1","2.4.5","2.4.4.6","2.4.4.5","2.4.4.3","2.4.4.2","2.4.4","2.4.3.12","2.4.3.11","2.4.3.10","2.4.3.7","2.4.3","2.4.2","2.4.1","2.4.0","2.3.7","2.3.6","2.3.5","2.3.4","2.3.3","2.3.2","2.3.1","2.2.0","2.1.2.0","v2.1.1.3","2.1.2","2.1.1","v2.0.0","0.2.0","0.1.7"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-56721.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}