CVE-2026-62420: CWE-863 Incorrect Authorization in Canonical LXD
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.
AI Analysis
Technical Summary
This vulnerability in LXD arises from improper authorization checks during cross-project instance migrations. When an instance is moved across projects to a different cluster member using the POST /1.0/instances/{name} endpoint with migration parameters, the destination node treats the request as an internal cluster notification and skips project restriction enforcement. This bypass allows an authenticated attacker to circumvent project-level security controls and deploy instance configurations that should be disallowed in the target project. The flaw is tracked as CWE-863 (Incorrect Authorization). Affected versions include =5.0.0, =5.21.0, =6.0, >=5.0.0 <5.0.8, >=5.21.0 <5.21.6, and >=6.0 <6.10. No official patch or remediation level has been published yet.
Potential Impact
Successful exploitation allows an authenticated attacker to bypass project security restrictions and introduce unauthorized instance configurations into restricted projects. This can lead to full compromise of confidentiality, integrity, and availability of the affected LXD environment, as indicated by the CVSS vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, administrators should consider restricting access to authenticated users and carefully monitor cross-project migration activities. No vendor advisory or patch links are currently available.
CVE-2026-62420: CWE-863 Incorrect Authorization in Canonical LXD
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.
CVSS v3.1
Score 9.9critical
Affected software
pkg:github/LXDRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in LXD arises from improper authorization checks during cross-project instance migrations. When an instance is moved across projects to a different cluster member using the POST /1.0/instances/{name} endpoint with migration parameters, the destination node treats the request as an internal cluster notification and skips project restriction enforcement. This bypass allows an authenticated attacker to circumvent project-level security controls and deploy instance configurations that should be disallowed in the target project. The flaw is tracked as CWE-863 (Incorrect Authorization). Affected versions include =5.0.0, =5.21.0, =6.0, >=5.0.0 <5.0.8, >=5.21.0 <5.21.6, and >=6.0 <6.10. No official patch or remediation level has been published yet.
Potential Impact
Successful exploitation allows an authenticated attacker to bypass project security restrictions and introduce unauthorized instance configurations into restricted projects. This can lead to full compromise of confidentiality, integrity, and availability of the affected LXD environment, as indicated by the CVSS vector (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H).
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, administrators should consider restricting access to authenticated users and carefully monitor cross-project migration activities. No vendor advisory or patch links are currently available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- canonical
- Date Reserved
- 2026-07-14T08:57:47.667Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a7cc907bf8831d5390770fc
Added to database: 08/12/2026, 19:27:03 UTC
Last enriched: 08/12/2026, 19:56:54 UTC
Last updated: 08/12/2026, 23:03:39 UTC
Views: 4
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