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Vulnerability record · CVE-2026-43001 · published 1 May 2026

CVE-2026-43001: Openstack keystone incorrect authorization vulnerability

Openstack · Keystone

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.

8.0 CVSS 3.1 High EPSS 0.59% · top 54.1% CWE-863 · Incorrect authorizationCWE-1288 · CWE-1288
8.0CVSS 3.1 base score
0.59%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 1 tagged exploit
14 Aug 2026Last modified by NVD

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:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.launchpad.net/keystone/+bug/2149775 ExploitIssue TrackingPatchThird Party Advisory
https://review.opendev.org/c/openstack/keystone/+/985804 Patch
https://security.openstack.org/ossa/OSSA-2026-015.html PatchVendor Advisory
https://access.redhat.com/errata/RHSA-2026:39808
https://access.redhat.com/errata/RHSA-2026:54757
https://access.redhat.com/security/cve/CVE-2026-43001
https://bugzilla.redhat.com/show_bug.cgi?id=2464305
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43001.json

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.8CVE-2026-42998Openstack keystone incorrect authorization vulnerabilityAn issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user …EPSS 0.40%8.8CVE-2026-42999Openstack keystone incorrect authorization vulnerabilityAn issue was discovered in OpenStack Keystone before 29.0.2. The Keystone RBAC policy enforcer in enforce_call unconditionally merges the raw JSON re…EPSS 0.42%8.8CVE-2026-43000Openstack keystone incorrect authorization vulnerabilityAn issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker wi…EPSS 0.43%8.8CVE-2020-12689Openstack keystone improper privilege management vulnerabilityAn issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. Any user authenticated within a limited scope (trust/oauth/application crede…EPSS 1.6%8.8CVE-2020-12690Openstack keystone insufficient session expiration vulnerabilityAn issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. The list of roles provided for an OAuth1 access token is silently ignored. T…EPSS 1.9%8.8CVE-2020-12691Openstack keystone incorrect authorization vulnerabilityAn issue was discovered in OpenStack Keystone before 15.0.1, and 16.0.0. Any authenticated user can create an EC2 credential for themselves for a pro…EPSS 4.9%8.8CVE-2019-19687Openstack keystone insufficiently protected credentials vulnerabilityOpenStack Keystone 15.0.0 and 16.0.0 is affected by Data Leakage in the list credentials API. Any user with a role on a project is able to list any c…EPSS 1.8%8.1CVE-2026-44394Openstack keystone incorrect authorization vulnerabilityAn issue was discovered in OpenStack Keystone before 29.0.2. The Keystone federated token rescoping mechanism does not propagate the original token's…EPSS 0.32%

Source: NIST National Vulnerability Database (record CVE-2026-43001), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.