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    2 vulnerabilities by Proxmox Server Solutions GmbH

    CVE-2023-54391 (GCVE-0-2023-54391)

    Vulnerability from nvd – Published: 2026-09-01 21:59 – Updated: 2026-09-03 14:28 Unsupported When Assigned X_Known Exploited Vulnerability
    VLAI Previdian
    Title
    Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter
    Summary
    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.
    Severity
    9.3 (Critical)
    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
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-02 11:55 UTC
    CWE
    • CWE-304 - Missing Critical Step in Authentication
    Assigner
    References
    Impacted products
    Vendor Product Version
    Proxmox Server Solutions GmbH Proxmox Virtual Environment (VE) Affected: 7.0 , ≤ 7.4 (custom)
    Affected: 8.0 (custom)
    		Create a notification for this product.
    Date Public
    2023-07-14 00:00
    Credits
    Kamil Rakowski Nathan Xavier Golez Sagnik Sasmal
    Show details on NVD website
    To clipboard 

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    CVE-2023-54391 (GCVE-0-2023-54391)

    Vulnerability from cvelistv5 – Published: 2026-09-01 21:59 – Updated: 2026-09-03 14:28 Unsupported When Assigned X_Known Exploited Vulnerability
    VLAI Previdian
    Title
    Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter
    Summary
    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.
    Severity
    9.3 (Critical)
    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
    9.8 (Critical)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    SSVC
    Exploitation: none Automatable: yes Technical Impact: total
    CISA Coordinator · CISA-ADP (v2.0.3)
    Decision recorded 2026-09-02 11:55 UTC
    CWE
    • CWE-304 - Missing Critical Step in Authentication
    Assigner
    References
    Impacted products
    Vendor Product Version
    Proxmox Server Solutions GmbH Proxmox Virtual Environment (VE) Affected: 7.0 , ≤ 7.4 (custom)
    Affected: 8.0 (custom)
    		Create a notification for this product.
    Date Public
    2023-07-14 00:00
    Credits
    Kamil Rakowski Nathan Xavier Golez Sagnik Sasmal
    Show details on NVD website
    To clipboard 

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