CVE-2026-55707: CWE-863 Incorrect Authorization in OpenStack Neutron
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.
AI Analysis
Technical Summary
This vulnerability in OpenStack Neutron's subnetpool onboarding API allows an authenticated user to onboard subnets belonging to other projects without proper authorization checks. By exploiting this flaw, the attacker can modify the subnet state of victims and affect L3 routing and address scope behavior of victim routers. The issue affects versions 14.0.0, 27.0.0, and 28.0.0 of Neutron. There is no vendor advisory or patch information currently available, and the remediation level is not specified.
Potential Impact
An attacker with authenticated access can onboard subnets from other projects' shared networks into their own subnetpool, causing unauthorized mutation of subnet states. This can disrupt L3 routing and address scope behavior for victim routers, potentially impacting network traffic and isolation between tenants in a multi-tenant cloud environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict authenticated user permissions to limit access to subnetpool onboarding APIs and monitor for unusual subnetpool modifications.
CVE-2026-55707: CWE-863 Incorrect Authorization in OpenStack Neutron
Description
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.
CVSS v4.0
Score 7.1high
Affected software
OpenStack
Neutron
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability in OpenStack Neutron's subnetpool onboarding API allows an authenticated user to onboard subnets belonging to other projects without proper authorization checks. By exploiting this flaw, the attacker can modify the subnet state of victims and affect L3 routing and address scope behavior of victim routers. The issue affects versions 14.0.0, 27.0.0, and 28.0.0 of Neutron. There is no vendor advisory or patch information currently available, and the remediation level is not specified.
Potential Impact
An attacker with authenticated access can onboard subnets from other projects' shared networks into their own subnetpool, causing unauthorized mutation of subnet states. This can disrupt L3 routing and address scope behavior for victim routers, potentially impacting network traffic and isolation between tenants in a multi-tenant cloud environment.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict authenticated user permissions to limit access to subnetpool onboarding APIs and monitor for unusual subnetpool modifications.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-17T01:24:38.456Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a72cd1bbf8831d5394f40a0
Added to database: 08/05/2026, 05:41:47 UTC
Last enriched: 08/12/2026, 15:03:37 UTC
Last updated: 09/17/2026, 22:01:36 UTC
Views: 34
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