---
id: CVE-2026-92761
title: >-
  WebVirtCloud fails to properly validate permission flags in UserInstance
  grants, allowing view-only users to perform privileged actions
summary: >-
  WebVirtCloud fails to properly validate permission flags in UserInstance
  grants, allowing view-only users to perform privileged actions. Attackers with
  read-only grants can power off virtual machines, reset root passwords, install
  SSH ke…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-862
vendor: retspen
product: webvirtcloud
affected:
  - webvirtcloud 1b2da68b2800f94674dd96f4a986cde30ac88280
published: '2026-09-16'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:48.237'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-92761'
references:
  - url: 'https://github.com/retspen/webvirtcloud'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L316-L330
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L356-L363
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30ac88280/instances/views.py#L538-L546
    label: disclosure@vulncheck.com
  - url: 'https://github.com/retspen/webvirtcloud/issues/682'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/webvirtcloud-missing-authorization-on-instance-control-actions
    label: disclosure@vulncheck.com
  - url: 'https://github.com/retspen/webvirtcloud/issues/682'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00614
epssPercentile: 0.4718
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-21T17:48:35.204918Z'
ingestedAt: '2026-09-16T21:05:36.897Z'
---

## Overview

WebVirtCloud fails to properly validate permission flags in UserInstance grants, allowing view-only users to perform privileged actions. Attackers with read-only grants can power off virtual machines, reset root passwords, install SSH keys, and manage ISO images by exploiting the get_instance gate that only checks grant existence.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.