PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-33551 OpenStack CVE debrief

A low-severity vulnerability was discovered in OpenStack Keystone, affecting versions 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. The issue allows an authenticated user with only a reader role to create EC2 credentials using a restricted application credential, potentially bypassing role restrictions.

Vendor
OpenStack
Product
Keystone
CVSS
LOW 3.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-10
Original CVE updated
2026-06-05
Advisory published
2026-04-10
Advisory updated
2026-06-05

Who should care

Deployments using restricted application credentials with the EC2/S3 compatibility API (swift3 / s3api) are affected.

Technical summary

The vulnerability exists in OpenStack Keystone, specifically in versions 14 through 26 before 26.1.1, 27.0.0, 28.0.0, and 29.0.0. Restricted application credentials can be used to create EC2 credentials, allowing an authenticated user with a reader role to obtain EC2/S3 credentials with the full set of parent user's S3 permissions.

Defensive priority

low

Recommended defensive actions

  • Upgrade to a non-vulnerable version of OpenStack Keystone (26.1.1, 27.0.1, 28.0.1, or 29.0.1).
  • Review and restrict application credentials and roles.
  • Monitor for suspicious activity related to EC2/S3 credentials.

Evidence notes

The vulnerability was discovered and reported through the OpenStack bug tracking system.

Official resources

public