Keystone up to 26.1.0/27.0.0/28.0.0/29.0.0 EC2 Credential Creation Endpoint improper authorization

Summaryinfo

A vulnerability identified as critical has been detected in Keystone up to 26.1.0/27.0.0/28.0.0/29.0.0. Affected by this vulnerability is an unknown functionality of the component EC2 Credential Creation Endpoint. The manipulation leads to improper authorization. This vulnerability is referenced as CVE-2026-33551. Remote exploitation of the attack is possible. No exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Keystone up to 26.1.0/27.0.0/28.0.0/29.0.0. This issue affects some unknown functionality of the component EC2 Credential Creation Endpoint. The manipulation with an unknown input leads to a improper authorization vulnerability. Using CWE to declare the problem leads to CWE-285. The product does not perform or incorrectly performs an authorization check when an actor attempts to access a resource or perform an action. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at seclists.org. The identification of this vulnerability is CVE-2026-33551. The exploitation is known to be easy. The attack may be initiated remotely. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1548.002 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 305614 (Linux Distros Unpatched Vulnerability : CVE-2026-33551), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at review.opendev.org.

The vulnerability is also documented in the vulnerability database at Tenable (305614). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Keystone

Version

• 26.0
• 26.1.0
• 27.0
• 28.0
• 29.0

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Be aware that VulDB is the high quality source for vulnerability data.

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