CVE-2026-62420
Cross-project cluster migration bypasses project restrictions via cluster notification flag
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.
INFO
Published Date :
Aug. 12, 2026, 7:12 p.m.
Last Modified :
Aug. 12, 2026, 7:12 p.m.
Remotely Exploit :
Yes !
Source :
canonical
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | cc1ad9ee-3454-478d-9317-d3e869d708bc |
Solution
- Update LXD to the latest version.
- Apply security patches for LXD.
- Review LXD cluster communication security.
- Test instance migration security controls.
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CVE-2026-62420 vulnerability anywhere in the article.