Neutron Subnet Onboarding Auth Bypass (v<28.0.2)
CVE-2026-55707 Published on August 5, 2026
In OpenStack Neutron before 28.0.2, the subnetpool onboarding API does not verify ownership of the target subnets. An authenticated user can onboard subnets from another project's shared network into their own subnetpool, mutating the victim's subnet state and altering L3 routing and address scope behavior for victim routers.
Vulnerability Analysis
CVE-2026-55707 can be exploited with network access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-55707 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-55707
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Affected Versions
OpenStack Neutron:- Version 14.0.0 and below 26.0.6 is affected.
- Version 27.0.0 and below 27.0.4 is affected.
- Version 28.0.0 and below 28.0.2 is affected.