CVE-2026-84165 Lack of authorisation in OpenNebula by OpenNebula Systems
Authenticated users can execute commands on other users' virtual machines if qemu-agent is enabled, leading to potential compromise.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84165?
CVE-2026-84165 is a high-severity missing authorization vulnerability in OpenNebula, published on 1 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability relating to incorrect access control in OpenNebula by OpenNebula Systems, affecting all versions prior to 7.4. This vulnerability could allow an authenticated user with basic permissions to execute commands on virtual machines belonging to other users via the `one.vm.exec` function, without proper verification of access permissions. To exploit the vulnerability, it is only necessary to know the virtual machine’s identifier and for qemu-agent to be enabled on that machine. Exploitation could allow commands to be executed and compromise the confidentiality, integrity and availability of the affected virtual machines.
Weakness: CWE-284
Which versions are affected by CVE-2026-84165?
How do I fix CVE-2026-84165?
No fix has been published for CVE-2026-84165 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84165 being exploited?
There is no known exploitation of CVE-2026-84165 in the wild and no public exploit code.
Sources
Also known as GHSA-m4j2-w8wf-vp83, UBUNTU-CVE-2026-84165.