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.
References (3)
Core 3
Core References
Issue Tracking issue-tracking
https://launchpad.net/bugs/2152113
Vendor Advisory vendor-advisory
https://security.openstack.org/ossa/OSSA-2026-032.html
Vendor Advisory vendor-advisory
mailing-list
https://www.openwall.com/lists/oss-security/2026/07/29/5
Scores
CVSS v4
7.1
EPSS
0.0049
EPSS Percentile
39.4%
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-863
Status
published
Products (3)
OpenStack/Neutron
14.0.0 - 26.0.6
OpenStack/Neutron
27.0.0 - 27.0.4
OpenStack/Neutron
28.0.0 - 28.0.2
Published
Aug 05, 2026
Tracked Since
Aug 05, 2026