CVSS 10.0 LXD, MicroCloud Flaw Lets Attackers Impersonate Trusted Clients Without a Private Key
A critical flaw in Canonical's LXD and MicroCloud let an attacker log in as a trusted client without holding that client's private key. To do it, the attacker had to reach their HTTPS API over the network and have the trusted client's public certificate. Once in, the attacker would act as that client, with access to the cluster and its virtual machines. If the impersonated account is privileged, the attacker could gain "root access to the host machine," Canonical said. The flaw, tracked as CVE-2026-112816 , carries a maximum CVSS score of 10.0, and Canonical has released fixed versions of both products. How the Flaw Works LXD and MicroCloud let remote clients access their APIs over mutual TLS, a setup in which the client presents a certificate to prove who it is. A client is trusted when its certificate is in the server's trust store, the list of identities the server will accept. The flaw was in how the server checked that certificate. It compa...
Nov 01, 2026