{"id":"CVE-2026-63300","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-63300","summary":"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…","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.","published":"2026-08-12T20:17:47.953","modified":"2026-08-12T20:17:47.953","cvss":{"score":9.9,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/canonical/lxd/pull/18605","label":"canonical/lxd#18605"},"references":[{"type":"WEB","url":"https://github.com/canonical/lxd/pull/18605"},{"type":"WEB","url":"https://github.com/canonical/lxd/pull/18651"},{"type":"WEB","url":"https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T20:17:47.953"}}