Critical · published August 13, 2026
An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass target project security restrictions during cross-project instance migrations. When moving an instance cross-project to a different cluster member via POST /1.0/instances/{name} with migration: true, project: <target>, and target: <member>, the destination node skips all project restriction checks because the request arrives as an internal cluster notification. An attacker can exploit this to introduce disallowed instance configurations into a restricted project.
| Product | Versions | Fixed in |
|---|---|---|
| canonical/lxd | ≥ 5.0.0, < 5.0.8 | 5.0.8 |
| canonical/lxd | ≥ 5.1, < 5.21.6 | 5.21.6 |
| canonical/lxd | ≥ 6.0, < 6.10 | 6.10 |