3.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-33551

CVE-2026-33551: OpenStack Keystone: Restricted application credentials can create EC2 credentials

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.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2026-33551

CVE-2026-33551:

3.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

SSVC / BOD 26-04 ↗

Exploitation pocAutomatable NoTech Impact Partial

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Package Name	Ecosystem	Vulnerable Versions	First Patched Version
keystone	pip	>= 14.0.0, < 26.1.1	26.1.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability allows a user with a restricted application credential (e.g., read-only) to create EC2 credentials that have the full permissions of the parent user, effectively bypassing the restrictions of the application credential. This is because the EC2 credential creation API endpoint did not check if the application credential was restricted.

The patch addresses this by adding a check, _check_unrestricted_application_credential, to the post method of the UserOSEC2CredentialsResourceListCreate class in keystone/api/users.py. This ensures that only unrestricted application credentials can be used to create EC2 credentials. The change to keystone/common/policies/ec2_credential.py further tightens the policy for creating and deleting EC2 credentials, requiring a 'member' role, which prevents users with only a 'reader' role from performing these actions.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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