EUVD-2026-45182
GHSA-vjf4-fxgw-f2mh
Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Race condition dependent on a parallel victim session raises AC to H; needs an authenticated user with VM.Console (PR:L), and a hijacked console yields full C/I/A over the target VM.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager 9.1.x before 9.1.9 and 8.4.x before 8.4.19; qemu-server 9.1.x before 9.1.7 and 8.4.x before 8.4.7; and pve-container 6.1.x before 6.1.3 and 5.3.x before 5.3.4 allows an attacker with privileges to call "vncproxy" to hijack a VNC session that is established in parallel by a different user for a different VM.
AnalysisAI
Session hijacking in Proxmox Virtual Environment (PVE 9.x/8.4.x) lets an authenticated user with rights to call the "vncproxy" API race the parallel "vncwebsocket" call and seize a VNC console session that a different user legitimately opened for a different VM. The flaw (CWE-362, CVSS 7.2) grants full interactive console access to another tenant's virtual machine, breaking isolation between users. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires an authenticated Proxmox account holding privileges to call the "vncproxy" API (i.e., VM.Console on at least one VM), network reach to the PVE API on port 8006, and - critically - a concurrent, parallel VNC session being established by a different user for a different VM to hijack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:U, C:H/I:H/A:H, base 7.2) rates this High with network reach but requiring existing privileges, no user interaction, and full C/I/A impact once triggered. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | On a shared Proxmox cluster, a low-trust tenant with VM.Console rights repeatedly and rapidly calls the vncproxy API while another administrator or tenant opens a noVNC console for a different VM; by winning the timing race with the victim's vncwebsocket upgrade, the attacker's websocket attaches to the victim's VNC stream and gains interactive keyboard/screen control of a VM they were never authorized to access. No user interaction from the victim beyond their normal console use is required, and no public POC is currently known. |
| Remediation | Vendor-released patch: upgrade pve-manager to 9.1.9 (8.x line: 8.4.19), qemu-server to 9.1.7 (8.x line: 8.4.7), and pve-container to 6.1.3 (5.x line: 5.3.4); apply all three together via the standard Proxmox repositories (apt update && apt full-upgrade) since the fix is split across the console-handling packages, then restart the pveproxy/pvedaemon services as directed. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all PVE 9.x and 8.4.x instances and document which users hold vncproxy API permissions; review access logs for vncproxy and vncwebsocket calls to identify any anomalous session takeovers. …
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
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