{"id":"CVE-2023-54391","revision":"5be201b69f974da0a9c38c13c2a33c92","records":[{"revision":"5be201b69f974da0a9c38c13c2a33c92","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-54391","aliases":[],"title":"Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter","description":"Proxmox Virtual Environment (VE) 7.0 through 8.0 contains an authentication bypass vulnerability in libpve-access-control before 8.0.4 that allows unauthenticated attackers to authenticate as any existing enabled user without a configured second factor by supplying an arbitrary tfa-challenge value in the API login endpoint. Attackers can send a POST request to the access ticket API endpoint with any value in the tfa-challenge parameter to completely skip password verification, gaining unauthorized access including to the root@pam account. All affected releases are end of life.","state":0,"publishedAt":"2026-09-01T21:59:12.692+00:00","modifiedAt":"2026-10-01T15:19:44.628+00:00","affected":[{"ecosystem":"Vendor product","name":"Proxmox Virtual Environment (VE)","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"defaultStatus\": \"unaffected\",\n                    \"vendor\": \"Proxmox Server Solutions GmbH\",\n                    \"product\": \"Proxmox Virtual Environment (VE)\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"7.0\",\n                            \"versionType\": \"custom\",\n                            \"lessThanOrEqual\": \"7.4\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.0\",\n                            \"versionType\": \"custom\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":9.3,"severity":"CRITICAL"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-4#post-867929","https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=032e7d6d441f89a48cadfd7f47e957c8a561c022","https://git.proxmox.com/?p=pve-access-control.git;a=commit;h=0f3d14d6be4d9f23e511701696a529ef3b7ffd61","https://www.vulncheck.com/advisories/proxmox-ve-authentication-bypass-via-tfa-challenge-parameter"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-54391","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-54391","identifiers":["CVE-2023-54391"]},"retained":false,"historicalAffected":[]}],"coverage":[]}