CVE-2026-63300Critical· 9.9▾ MidnightAn 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 res…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 54.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 11.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
Last analysed / modified upstream
0.3%
0.3% → 0.4%
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.
lxd >= 5.0.0, < 5.0.8lxd >= 5.1, < 5.21.6lxd >= 6.0, < 6.10Upgrade past the affected range:
lxd 6.10Connected by shared product, vendor, weakness, or advisory.
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