{"cvss":0.0,"datePublished":"2026-09-01T00:00:00Z","dateUpdated":"2026-09-01T00:00:00Z","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.","dueDate":"","id":"CVE-2023-54391","kev_catalogs":["vulncheck"],"knownRansomwareCampaignUse":"Known","product":"Proxmox Virtual Environment (VE)","requiredAction":"Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.","severity":"CRITICAL","source":"vulncheck_kev","title":"proxmox virtual_environment Missing Critical Step in Authentication","vendor":"Proxmox Server Solutions GmbH"}