CVE-2026-51083Network attack vector

Password-hash disclosure via unmasked cloudinit dump

Published Jul 17, 2026 · Updated Jul 17, 2026

Improper access control in Proxmox VE qemu-server allows remote authenticated users with limited privileges to obtain password hashes. The cloudinit/dump API returns the real cipassword hash to VM.Audit callers instead of applying the masking used by the provisioning endpoint. VM.Audit privileges, including the PVEAuditor role, are sufficient on 9.x qemu-server before 9.1.8 and 8.x before 8.4.8; the response exposes a hash, not plaintext or write access.

CVSS severity6.5
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Proxmox VE qemu-server allows remote authenticated users with limited privileges to obtain password hashes. The cloudinit/dump API returns the real cipassword hash to VM.Audit callers instead of applying the masking used by the provisioning endpoint. VM.Audit privileges, including the PVEAuditor role, are sufficient on 9.x qemu-server before 9.1.8 and 8.x before 8.4.8; the response exposes a hash, not plaintext or write access.

The record

CVE
CVE-2026-51083
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-284, T1552
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1552Unsecured Credentials

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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