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CVE-2026-63300

Canonical Lxd broken access control

9.9 CRITICALPublic exploitEPSS 0.54%
  1. Published12 Aug 2026

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Canonical Lxd≥ 5.0.0 < 5.0.8 · ≥ 5.1 < 5.21.6 · ≥ 6.0 < 6.10

Remediation

Fixed in
Canonical Lxd≥ 5.0.8

References

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Frequently asked

Is CVE-2026-63300 being actively exploited?

CVE-2026-63300 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.54%.

How severe is CVE-2026-63300?

CVE-2026-63300 has a CVSS 3.1 base score of 9.9, rated critical. EPSS estimates a 0.54% probability of exploitation.

Which products are affected by CVE-2026-63300?

Affected products include Canonical Lxd.

How do I fix CVE-2026-63300?

Upgrade affected software to a fixed version, for example Canonical Lxd 5.0.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-63300 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.