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CVE-2026-63300— Cross-project instance move bypasses all project restrictions allowing host command execution

Quick assessment

Affected
Canonical LXD
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD 5.0.0至5.0.8之前版本、5.21.0至5.21.6之前版本和6.0至6.10之前版本存在授权问题漏洞，该漏洞源于instancePostMigration函数中lxd/instance_post.go存在不当验证，可能导致经过身份验证的攻击者绕过项目级安全限制。

CVSS 9.9 · Critical EPSS 0.29% · P22

Affected Version Matrix 3

VendorProduct Version RangeStatus
Canonical LXD 5.0.0< 5.0.8 affected
5.21.0< 5.21.6 affected
6.0< 6.10 affected
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I. Basic Information for CVE-2026-63300

Vulnerability Information
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Vulnerability Title
Cross-project instance move bypasses all project restrictions allowing host command execution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 Canonical LXD 5.0.0至5.0.8之前版本、5.21.0至5.21.6之前版本和6.0至6.10之前版本存在授权问题漏洞，该漏洞源于instancePostMigration函数中lxd/instance_post.go存在不当验证，可能导致经过身份验证的攻击者绕过项目级安全限制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical LXD 5.0.0 ~ 5.0.8 -

II. Public POCs for CVE-2026-63300

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8203 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-63300

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Patches & Fixes for CVE-2026-63300 (2)

Vendor Advisories for CVE-2026-63300 (1)

Same Patch Batch · Canonical · 2026-08-12 · 11 CVEs total

CVE-2026-62420 9.9 CRITICAL Cross-project cluster migration bypasses project restrictions via cluster notification fla
CVE-2026-63296 9.9 CRITICAL Project restriction bypass via instance migration config override
CVE-2026-63293 9.9 CRITICAL Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as
CVE-2026-63294 9.9 CRITICAL Root RCE via image backup.yaml symlink
CVE-2026-63297 9.9 CRITICAL Cross-project instance copy bypasses target project restrictions via TOCTOU in config merg
CVE-2026-66898 9.9 CRITICAL Path traversal via unvalidated instance name in backup tarball restore enables root file w
CVE-2026-63298 8.7 HIGH LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration
CVE-2026-63299 8.5 HIGH Storage volume cross-project move and snapshot restore bypass project disk limits
CVE-2026-16033 8.5 HIGH Arbitrary file read+write on host via templates/ symlink in malicious image
CVE-2026-63295 4.3 MEDIUM Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `sec

IV. Related Vulnerabilities

Same product: LXD
Same vendor: Canonical
Same weakness: CWE-862

V. Comments for CVE-2026-63300

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