UBUNTU-CVE-2026-43001

Description

An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.

CVSS Metrics

• v3.1•HIGH•Score: 8CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected Systems

• ubuntu•keystone

  all | all | all | all | all | all | all | < 2:21.0.1-0ubuntu2.4 | < 2:25.0.0-0ubuntu1.4 | < 2:28.0.0-0ubuntu1.3 | < 2:29.0.0-0ubuntu1.2

References (5)

• https://ubuntu.com/security/CVE-2026-43001
• https://www.cve.org/CVERecord?id=CVE-2026-43001
• https://bugs.launchpad.net/keystone/+bug/2149775
• https://review.opendev.org/c/openstack/keystone/+/985804
• https://ubuntu.com/security/notices/USN-8433-1