---
cve: "CVE-2026-63300"
severity: "CRITICAL"
cvss: 9.9
epss: "0.4%"
vendor: "Canonical"
kev: false
exploited: false
published: "2026-08-12 19:09:04"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-21T11:41:43+02:00"
---

# CVE-2026-63300

> 9.9 CRITICAL · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Verändert | bad |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- 58b58151cfc3bd9fb0fedce26fcdd73a3e67bdb8 (Commit)
- c6146714d0cacd04b77598bac149f5db714834f6 (Commit)

## Referenzen

- <https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2>
- <https://github.com/canonical/lxd/pull/18651>
- <https://github.com/canonical/lxd/pull/18605>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-63300) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_