What’s Vulnerable › Vulnerabilities

CVE-2026-50266

• Severity: low (CVSS 2.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-04 · updated 2026-07-22
• Weakness: CWE-863

Description

In OpenStack Neutron before 28.0.1, a project manager can create or update a port on a shared network owned by another project and set device_owner to a value that has "network:" at the beginning ("network:dhcp" for example). The default port RBAC policies incorrectly included PROJECT_MANAGER without requiring network ownership, allowing any project manager to obtain trusted network-service port behavior on shared networks. Depending on backend and deployment, this can bypass anti-spoofing and security group protections, enabling DHCP, MAC, or IP spoofing against other tenants on the shared network. This is a regression of CVE-2015-5240 (OSSA-2015-018).

Affected products

• OpenStack Neutron: from 25.0.0 before 25.2.4; from 26.0.0 before 26.0.4; from 27.0.0 before 27.0.3; from 28.0.0 before 28.0.1 — fixed in 25.2.4, 26.0.4, 27.0.3, 28.0.1

How to fix

Upgrade to a fixed version: OpenStack Neutron 25.2.4, 26.0.4, 27.0.3, 28.0.1. Check the vendor advisory for mitigations.

References

• https://launchpad.net/bugs/2152115
• https://review.opendev.org/990273
• https://review.opendev.org/990353
• https://review.opendev.org/990356
• https://www.openwall.com/lists/oss-security/2026/06/04/6
• https://bugs.launchpad.net/neutron/+bug/2152115

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