CVE-2026-84165: CWE-284 Improper Access Control in OpenNebula Systems OpenNebula
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.
CVSS v4.0
Score 8.7high
Affected software
OpenNebula Systems
OpenNebula
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in OpenNebula arises from incorrect access control checks in the one.vm.exec function. Authenticated users with minimal permissions can execute commands on virtual machines belonging to other users by knowing the VM identifier and having qemu-agent enabled on the target VM. This flaw could lead to unauthorized command execution, impacting the confidentiality, integrity, and availability of the virtual machines. The vulnerability affects all OpenNebula versions prior to 7.4.
Potential Impact
Exploitation allows an authenticated user with basic permissions to execute arbitrary commands on virtual machines of other users, potentially leading to full compromise of those VMs. This impacts the confidentiality, integrity, and availability of the affected virtual machines.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict access to authenticated users and consider disabling qemu-agent on virtual machines if feasible to reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- INCIBE
- Date Reserved
- 2026-09-01T08:05:51.571Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a96cab4acd9273b49b685b5
Added to database: 09/01/2026, 12:53:08 UTC
Last enriched: 09/07/2026, 15:08:33 UTC
Last updated: 10/16/2026, 06:48:19 UTC
Views: 102
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