[UPDATE] [medium] Proxmox Virtual Environment: Multiple vulnerabilities

mediumCVE-2026-51081 CVE-2026-51082 CVE-2026-51083

An attacker can exploit multiple vulnerabilities in Proxmox Virtual Environment to bypass security measures, disclose information, and conduct a cross-site scripting attack.

CSIRTS triage

vendor: Proxmox product: Virtual Environment Authentication bypass Information disclosure Cross-site scripting

What: Multiple vulnerabilities can bypass security measures, disclose information, and conduct cross-site scripting attacks.
Who is affected: Attackers exploiting vulnerabilities in Proxmox Virtual Environment.
Urgency: Remediation is medium urgency as exploitation is not currently observed but vulnerabilities exist.
Action: Update to the latest version of Proxmox Virtual Environment.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-07-22
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1266

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-510810.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all scored CVEs.
Low exploitation riskCVE-2026-510820.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 13% of all scored CVEs.
Low exploitation riskCVE-2026-510830.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-51081	coverage & exploitation status	NVD · CVE.org
CVE-2026-51082	coverage & exploitation status	NVD · CVE.org
CVE-2026-51083	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Proxmox Virtual Environment

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] Proxmox Virtual Environment: Multiple vulnerabilitiescert-bund · 2026-07-20
mediumCVE-2026-51083: Incorrect access control in Proxmox Virtual Environment (PVE) 9.x qemu-server before 9.1.8 and…nvd · 2026-07-17
highCVE-2026-51082: A race condition between the vncproxy and vncwebsocket API calls in Proxmox Virtual Environmen…nvd · 2026-07-17
mediumCVE-2026-51081: A cross-site scripting (XSS) vulnerability in Proxmox Virtual Environment (PVE) 9.x 5.1.8 and …nvd · 2026-07-17