CVE-2026-33551: Openstack Keystone

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in OpenStack Keystone 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can create EC2 credentials. By using a restricted application credential to call the EC2 credential creation API, an authenticated user with only a reader role may obtain an EC2/S3 credential that carries the full set of the parent user's S3 permissions, effectively bypassing the role restrictions imposed on the application credential. Only deployments that use restricted application credentials in combination with the EC2/S3 compatibility API (swift3 / s3api) are affected.

Affected products

• Openstack Keystone: from 14.0.0, before 26.1.1 (fixed in 26.1.1); version 27.0.0 only; version 28.0.0 only; version 29.0.0 only

Published 2026-04-10. Last modified 2026-06-17.