# CVE-2026-51083: Proxmox PVE incorrect access control in qemu-server cloudinit/dump API

Source: https://junglewise.ai/threats/cve-2026-51083-proxmox-pve-incorrect-access-control-in-qemu-server-cloudinit  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-17. Updated: 2026-07-17  
License: CC BY 4.0 with a link back

CVE-2026-51083 · Severity: info · Published 2026-07-17

Proxmox Virtual Environment (PVE) is a platform for managing virtual machines and containers. A security flaw in the server component allows users with restricted access to view sensitive information they should not be able to see. Specifically, an attacker with limited privileges can obtain hashed passwords for virtual machines, which could potentially lead to further unauthorized access if those passwords are cracked.

Vendors: [Proxmox](https://junglewise.ai/threats/vendors/proxmox).

## Quick answers

**Is CVE-2026-51083 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-51083 being exploited in the wild.

**How severe is CVE-2026-51083?** Informational severity, published 17 July 2026.

**Which products and versions are affected?** Proxmox QEMU Server 9.x before 9.1.8, 8.x before 8.4.8.

**Is there a fix for CVE-2026-51083?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-51083 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-51083?** Check whether you run Proxmox QEMU Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An incorrect access control vulnerability exists in the qemu-server component of Proxmox Virtual Environment (PVE). The flaw is located within the cloudinit/dump API endpoint, which fails to properly restrict access based on user permissions. An authenticated attacker with limited privileges can query this API to retrieve sensitive configuration data, including hashed user passwords. This information disclosure can facilitate offline brute-force attacks to recover plaintext credentials. The issue is resolved in qemu-server versions 9.1.8 (for PVE 9.x) and 8.4.8 (for PVE 8.x).

## Affected products

- Proxmox qemu-server 9.x before 9.1.8, 8.x before 8.4.8

## Timeline

- 2026-07-17: disclosed: CVE published to NVD

## References

- [https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-2](https://forum.proxmox.com/threads/proxmox-virtual-environment-security-advisories.149331/page-2)

## Related threats

- [Proxmox Virtual Environment race condition in VNC session handling](https://junglewise.ai/threats/cve-2026-51082-proxmox-virtual-environment-race-condition-in-vnc-session)