Description
A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environment (PVE) 9.x pve-manager before 9.1.9 and 8.x before 8.4.19; qemu-server 9.x before 9.1.7 and 8.x before 8.4.7; and pve-container before 6.1.3 (PVE 9.x) and before 5.3.4 (PVE 8.x) 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.
Advisories 2
- WID-SEC-2026-1266 Proxmox Virtual Environment: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 21, 2026
- WID-SEC-2026-2417 Proxmox Virtual Environment: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 19, 2026