CVE-2026-50266Network attack vector

Cross-tenant spoofing via trusted port policy bypass

Published Jun 4, 2026 · Updated Jun 4, 2026

Authorization bypass in OpenStack Neutron 25.0.0, 26.0.0, 27.0.0, and 28.0.0 branches allows remote authenticated users to create trusted ports. The default port RBAC rules admit PROJECT_MANAGER for create and update operations on device_owner values beginning with network: without verifying network ownership. Reaching the flaw requires a project-manager role and another project's shared network; backend behavior determines whether DHCP, MAC, or IP spoofing bypasses tenant protections.

CVSS severity2.2
Low
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in OpenStack Neutron 25.0.0, 26.0.0, 27.0.0, and 28.0.0 branches allows remote authenticated users to create trusted ports. The default port RBAC rules admit PROJECT_MANAGER for create and update operations on device_owner values beginning with network: without verifying network ownership. Reaching the flaw requires a project-manager role and another project's shared network; backend behavior determines whether DHCP, MAC, or IP spoofing bypasses tenant protections.

The record

CVE
CVE-2026-50266
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
OpenStack
Product
Neutron
Classifications
CWE-639, T1557.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=25.0.0 <25.2.4
  2. Affected versionversion=26.0.0 <26.0.4
  3. Affected versionversion=27.0.0 <27.0.3
  4. Affected versionversion=28.0.0 <28.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenStack · Neutronversion=25.0.0 <25.2.4; version=26.0.0 <26.0.4; version=27.0.0 <27.0.3; version=28.0.0 <28.0.1

Published CVSS scores

2.2MITRECVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1557.003DHCP Spoofing

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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