CVE-2026-33551

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-04-10 · updated 2026-10-26
Weakness: CWE-863

Description

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; 27.0.0, 28.0.0, 29.0.0 — fixed in 26.1.1

How to fix

Upgrade to a fixed version: OpenStack Keystone 26.1.1. Check the vendor advisory for mitigations.

References

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