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Vulnerability record · CVE-2026-63300 · published 12 August 2026

CVE-2026-63300: Canonical lxd missing authorization vulnerability

Canonical · Lxd

An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.

9.9 CVSS 3.1 Critical EPSS 0.54% · top 56.9% CWE-862 · Missing authorization
9.9CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
11 Sep 2026Last modified by NVD

Description

An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/canonical/lxd/pull/18605 ExploitPatch
https://github.com/canonical/lxd/pull/18651 Patch
https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2 Vendor AdvisoryExploitMitigation

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.9CVE-2026-66897Canonical lxd path traversal vulnerabilityA path traversal vulnerability in LXD's instance template processing allows an attacker with container edit permissions, or any user launching a craf…EPSS 0.72%9.9CVE-2026-66898Canonical lxd path traversal vulnerabilityA path traversal vulnerability in LXD allows an attacker to manipulate file system paths during backup import and restore operations. When importing …EPSS 0.59%9.9CVE-2026-63293Canonical lxd link following vulnerabilityA link following vulnerability in LXD allows an attacker to achieve arbitrary file read and write operations on the host system. When importing or un…EPSS 0.59%9.9CVE-2026-63294Canonical lxd link following vulnerabilityA link following vulnerability in LXD allows an attacker to achieve root command execution on the host system. During the import or unpacking of craf…EPSS 0.88%9.9CVE-2026-63296Canonical lxd incorrect authorization vulnerabilityAn authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project restrictions during instance migration. When m…EPSS 0.44%9.9CVE-2026-63297Canonical lxd toctou race condition vulnerabilityAn authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target proj…EPSS 0.34%9.9CVE-2026-63298Canonical lxd os command injection vulnerabilityAn improper neutralization of special elements vulnerability in LXD's NVIDIA instance configuration handling allows an authenticated attacker to inje…EPSS 0.69%9.9CVE-2026-63299Canonical lxd allocation without limits vulnerabilityAn authorization bypass vulnerability in LXD allows an authenticated user to bypass project-level disk and volume limits. Two related code paths fail…EPSS 0.59%

Source: NIST National Vulnerability Database (record CVE-2026-63300), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.