{"id":"CVE-2026-63300","summary":"Cross-project instance move bypasses all project restrictions allowing host command execution","details":"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.","aliases":["GHSA-5g5r-wh97-qcq2"],"modified":"2026-08-15T11:30:51.299341797Z","published":"2026-08-12T19:09:04.445Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"6.0"},{"fixed":"6.10"}],"source":"AFFECTED_FIELD"}],"cna_assigner":"canonical","cwe_ids":["CWE-862"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63300.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63300.json"},{"type":"ADVISORY","url":"https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63300"},{"type":"FIX","url":"https://github.com/canonical/lxd/pull/18605"},{"type":"FIX","url":"https://github.com/canonical/lxd/pull/18651"},{"type":"PACKAGE","url":"https://github.com/canonical/lxd"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/canonical/lxd","events":[{"introduced":"1e1349e3cbf30c1b2ce74e531d4dd0fd52c45be1"},{"fixed":"58b58151cfc3bd9fb0fedce26fcdd73a3e67bdb8"},{"introduced":"761d134ceabd306f57acfb0ca51f59b03751a5b0"},{"fixed":"c6146714d0cacd04b77598bac149f5db714834f6"}],"database_specific":{"extracted_events":[{"introduced":"5.0.0"},{"fixed":"5.0.8"},{"introduced":"5.21.0"},{"fixed":"5.21.6"}],"source":"AFFECTED_FIELD"}}],"versions":["lxd-5.0.7","lxd-5.21.5","lxd-5.17","lxd-5.16","lxd-5.15","lxd-5.14","lxd-5.13","lxd-5.12","lxd-5.11","lxd-5.0.2","lxd-5.10","lxd-5.9","lxd-5.8","lxd-5.7","lxd-5.6","lxd-5.5","lxd-5.0.1","lxd-5.4","lxd-5.3","lxd-5.2","lxd-5.1","lxd-5.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63300.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"}]}