Incorrect authorization in OpenStack Neutron
Priority LOW 32CWE-863Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · Low
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-863.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00427 37th percentileScored 2026-11-07
Fix Partial Neutron (OpenStack): 26.0.6, 27.0.4, 28.0.2Red Hat: 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| OpenStack | Neutron | 14.0.0 to before 26.0.6; 27.0.0 to before 27.0.4; 28.0.0 to before 28.0.2 | 26.0.6, 27.0.4, 28.0.2 | Patch available | CNA |
- Neutron VendorOpenStack Affected 14.0.0 to before 26.0.6; 27.0.0 to before 27.0.4; 28.0.0 to before 28.0.2 Fixed in 26.0.6, 27.0.4, 28.0.2 Patch available CNA
Remediation
- Fix · CNA Neutron (OpenStack) Fixed in 26.0.6, 27.0.4, 28.0.2
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat OpenStack Platform 16.2 | Affected | No fix yet |
| Red Hat OpenStack Platform 17.1 | Affected | No fix yet |
| Red Hat OpenStack Platform 18.0 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55707
- 2026-10-03 Alias added: GHSA-v5q5-3vcq-49r5
References
More OpenStack vulnerabilities
- TI-2026-78562 Incorrect authorization in OpenStack Manila share operations CVSS 3.1CRITICAL 9.9
- TI-2026-63467 Code injection in OpenStack Octavia CVSS 4.0CRITICAL 9.4
- TI-2017-13226 The tcpmss_mangle_packet function in net/netfilter/xt_TCPMSS.c in the Linux kernel before… CVSS 3.1CRITICAL 9.8
- TI-2026-69629 OpenStack Mistral flaw lets users change other projects' resources CVSS 4.0HIGH 7.2
- TI-2026-69623 Command injection in OpenStack Mistral std.ssh_proxied action CVSS 4.0HIGH 8.7
- TI-2022-17779 Improper privilege management in OpenStack CVSS 3.1HIGH 8.8
Sources
- CVE-2026-55707 · CVE Program
- CVE-2026-55707 · NVD
- FIRST EPSS
- GHSA-v5q5-3vcq-49r5 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-55707 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences