cve-2023-54391

{
  "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"
}