{"id":"CVE-2026-63300","state":"PUBLISHED","title":"Cross-project instance move bypasses all project restrictions allowing host command execution","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.","publishedAt":"2026-08-12T19:09:04.445Z","updatedAt":"2026-08-13T13:19:51.113Z","severity":{"score":9.9,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","source":"canonical"},"assigner":"canonical","products":["Canonical LXD"],"affected":[{"vendor":"Canonical","product":"LXD","packageName":"LXD","defaultStatus":"unaffected","versions":[{"version":"5.0.0","status":"affected","lessThan":"5.0.8","versionType":"semver"},{"version":"5.21.0","status":"affected","lessThan":"5.21.6","versionType":"semver"},{"version":"6.0","status":"affected","lessThan":"6.10","versionType":"semver"}],"platforms":["Linux"],"repo":"https://github.com/canonical/lxd"}],"references":["https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2","https://github.com/canonical/lxd/pull/18651","https://github.com/canonical/lxd/pull/18605"],"weaknesses":["CWE-862"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/63xxx/CVE-2026-63300.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-63300","state":"PUBLISHED","datePublished":"2026-08-12T19:09:04.445Z","dateUpdated":"2026-08-13T13:19:51.113Z","assignerShortName":"canonical","assignerOrgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","dateReserved":"2026-07-16T10:01:05.653Z"},"containers":{"cna":{"title":"Cross-project instance move bypasses all project restrictions allowing host command execution","descriptions":[{"lang":"en","value":"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. 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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."}],"affected":[{"vendor":"Canonical","product":"LXD","packageName":"LXD","defaultStatus":"unaffected","versions":[{"version":"5.0.0","status":"affected","lessThan":"5.0.8","versionType":"semver"},{"version":"5.21.0","status":"affected","lessThan":"5.21.6","versionType":"semver"},{"version":"6.0","status":"affected","lessThan":"6.10","versionType":"semver"}],"platforms":["Linux"],"repo":"https://github.com/canonical/lxd"}],"references":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2","tags":["vdb-entry","vendor-advisory"]},{"url":"https://github.com/canonical/lxd/pull/18651","tags":["patch"]},{"url":"https://github.com/canonical/lxd/pull/18605","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseScore":9.9,"baseSeverity":"CRITICAL"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-862","lang":"en","description":"CWE-862 Missing Authorization","type":"CWE"}]}],"providerMetadata":{"shortName":"canonical","orgId":"cc1ad9ee-3454-478d-9317-d3e869d708bc","dateUpdated":"2026-08-12T19:09:04.445Z"},"impacts":[{"capecId":"CAPEC-180","descriptions":[{"lang":"en","value":"Exploiting Incorrectly Configured Access Control Security Levels"}]},{"capecId":"CAPEC-122","descriptions":[{"lang":"en","value":"Privilege Abuse"}]},{"capecId":"CAPEC-233","descriptions":[{"lang":"en","value":"Privilege Escalation"}]}],"source":{"discovery":"EXTERNAL"},"solutions":[{"lang":"en","value":"Upgrade to LXD version 5.0.8 or later, 5.21.6 or later, or 6.10 or later."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-13T03:55:57.925616Z","id":"CVE-2026-63300","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-13T13:19:51.113Z"}}]}}}