CVE-2026-40213: Openstack Cyborg

High severity, CVSS 7.4. EPSS: 0.3% chance of exploitation in the next 30 days.

OpenStack Cyborg before 16.0.1 uses rule:allow (check_str='@') as the default policy for multiple API endpoints. This unconditionally authorizes any request carrying a valid Keystone token regardless of roles, project membership, or scope. An authenticated user with zero role assignments can complete various actions such as reprogramming FPGA bitstreams on arbitrary compute nodes via agent RPC.

Affected products

• Openstack Cyborg: from 5.0.0, before 14.0.1 (fixed in 14.0.1); from 15.0.0, before 15.0.1 (fixed in 15.0.1); from 16.0.0, before 16.0.1 (fixed in 16.0.1)

Published 2026-05-07. Last modified 2026-06-17.