Proxmox Virtual Environment up to 8.4.7/9.1.7 qemu-server access control

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k1.51

Summaryinfo

A vulnerability, which was classified as problematic, was found in Proxmox Virtual Environment up to 8.4.7/9.1.7. This vulnerability affects unknown code of the component qemu-server. Executing a manipulation can lead to access control. This vulnerability is tracked as CVE-2026-51083. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability has been found in Proxmox Virtual Environment up to 8.4.7/9.1.7 and classified as problematic. This vulnerability affects some unknown functionality of the component qemu-server. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality. CVE summarizes:

Incorrect access control in Proxmox Virtual Environment (PVE) 9.x qemu-server before 9.1.8 and 8.x before 8.4.8 allows users within limited privileges to obtain hashed passwords via the cloudinit/dump API.

The advisory is available at forum.proxmox.com. This vulnerability was named CVE-2026-51083 since 06/07/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 9.1.8 or 8.4.8 eliminates this vulnerability.

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Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: Virtual Environment 9.1.8/8.4.8

Timelineinfo

06/07/2026 CVE reserved
07/17/2026 +40 days Advisory disclosed
07/17/2026 +0 days VulDB entry created
07/17/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: forum.proxmox.com
Status: Confirmed

CVE: CVE-2026-51083 (🔒)
GCVE (CVE): GCVE-0-2026-51083
GCVE (VulDB): GCVE-100-379822

Entryinfo

Created: 07/17/2026 17:06
Changes: 07/17/2026 17:06 (53)
Complete: 🔍
Cache ID: 216::103

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