CVE-2022-35508: Proxmox Mail Gateway

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

Proxmox Virtual Environment (PVE) and Proxmox Mail Gateway (PMG) are vulnerable to SSRF when proxying HTTP requests between pve(pmg)proxy and pve(pmg)daemon. An attacker with an unprivileged account can craft an HTTP request to achieve SSRF and file disclosure of any files on the server. Also, in Proxmox Mail Gateway, privilege escalation to the root@pam account is possible if the backup feature has ever been used, because backup files such as pmg-backup_YYYY_MM_DD_*.tgz have 0644 permissions and contain an authkey value. This is fixed in pve-http-server 4.1-3.

Affected products

• Proxmox Proxmox Mail Gateway: affected versions not specified
• Proxmox Pve HTTP Server: before 4.1-3 (fixed in 4.1-3)
• Proxmox Virtual Environment: affected versions not specified

Published 2022-12-04. Last modified 2026-06-17.