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.
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History
Thu, 03 Sep 2026 14:45:00 +0000
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Wed, 02 Sep 2026 17:30:00 +0000
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Proxmox
Proxmox proxmox Virtual Environment (ve) |
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Proxmox proxmox Virtual Environment (ve) |
Wed, 02 Sep 2026 12:45:00 +0000
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ssvc
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Tue, 01 Sep 2026 22:00:00 +0000
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| 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. | |
| Title | Proxmox VE 7.0-8.0 Authentication Bypass via tfa-challenge Parameter | |
| Weaknesses | CWE-304 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: VulnCheck
Published: 2026-09-01T21:59:12.692Z
Updated: 2026-09-03T14:28:03.483Z
Reserved: 2026-09-01T21:23:55.860Z
Link: CVE-2023-54391
Updated: 2026-09-02T11:56:14.034Z
Status : Deferred
Published: 2026-09-01T22:17:10.283
Modified: 2026-09-08T20:18:59.270
Link: CVE-2023-54391
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