---
id: CVE-2026-62420
title: >-
  An authorization bypass vulnerability in LXD allows an authenticated attacker
  to bypass target project security restrictions during cross-project instance
  migrations
summary: >-
  An authorization bypass vulnerability in LXD allows an authenticated attacker
  to bypass target project security restrictions during cross-project instance
  migrations. When moving an instance cross-project to a different cluster
  member vi…
severity: critical
cvss: 9.9
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cwe:
  - CWE-863
vendor: canonical
product: lxd
affected:
  - 'lxd >= 5.0.0, < 5.0.8'
  - 'lxd >= 5.1, < 5.21.6'
  - 'lxd >= 6.0, < 6.10'
patched:
  - lxd 6.10
published: '2026-08-12'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T14:32:59.620'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62420'
references:
  - url: 'https://github.com/canonical/lxd/pull/18605'
    label: security@ubuntu.com
  - url: 'https://github.com/canonical/lxd/pull/18651'
    label: security@ubuntu.com
  - url: 'https://github.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4g'
    label: security@ubuntu.com
  - url: 'https://github.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4g'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
epss: 0.00539
epssPercentile: 0.42978
ingestedAt: '2026-09-11T17:50:33.510Z'
---

## Overview

An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project security restrictions during cross-project instance migrations. When moving an instance cross-project to a different cluster member via POST /1.0/instances/{name} with migration: true, project: <target>, and target: <member>, the destination node skips all project restriction checks because the request arrives as an internal cluster notification. An attacker can exploit this to introduce disallowed instance configurations into a restricted project.

## Affected

- `lxd >= 5.0.0, < 5.0.8`
- `lxd >= 5.1, < 5.21.6`
- `lxd >= 6.0, < 6.10`

## Remediation

Upgrade past the affected range:

- `lxd 6.10`