CVE-2026-55707

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 scop...

CVE-2026-55707

CVE-2026-55707 affects OpenStack Neutron before 28.0.2. The subnetpool onboarding API (PUT /v2.0/subnetpools/{id}/onboard_network_subnets) does not verify subnet ownership, allowing an authenticated but lower-privileged user to onboard subnets from another project’s shared network into their own ...