Authorization bypass through user-controlled key in LXD - CVE-2026-12411
Published: June 29, 2026
Vulnerability identifier: #VU135798
CSH Severity: Low
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-12411
CWE-ID: CWE-639
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to read and modify another guest's custom storage volume data.
The vulnerability exists due to authorization bypass through a user-controlled key in the DevLXD instance device-update path when processing device PATCH requests that attach custom storage volumes. A local user can name another guest's volume in a crafted device PATCH request to read and modify another guest's custom storage volume data.
Only projects with security.devlxd.management.volumes enabled are vulnerable, and the issue affects cross-guest access within the same project without user interaction.
Affected software
LXD
How to mitigate CVE-2026-12411
Install security update from vendor's website.
LXD - update to 6.9