Description
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.
Affected products
canonical: lxd
References4
- github.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4g Vendor AdvisoryExploitMitigation
- github.com/canonical/lxd/security/advisories/GHSA-v9wr-9r7q-fh4g Vendor AdvisoryExploitMitigation
- github.com/canonical/lxd/pull/18605 Patch
- github.com/canonical/lxd/pull/18651 Patch
Metrics
- CVSS 3.1
-
9.9
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H - EPSS — exploit probability
- 1% percentile: 46 · as of 12 November 2026
- CWE
- CWE-863
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.