8.8
HIGH
CVSS 3.1
CVE-2026-43000
OpenStack Keystone Trust Delegation Privilege Escalation Vulnerability
Overview
Description
An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity.
Details
INFO
Published Date :
May 28, 2026, 7:16 p.m.
Last Modified :
July 23, 2026, 12:18 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 8254265b-2729-46b6-b9e3-3dfca2d5bfca | ||||
| CVSS 3.1 | MEDIUM | [email protected] | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
Update OpenStack Keystone to version 29.0.2 or later to fix authorization bypass.
- Update OpenStack Keystone to version 29.0.2.
- Review and restrict application credential usage.
- Limit member role privileges on projects.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43000.
| URL | Resource |
|---|---|
| https://bugs.launchpad.net/keystone/+bug/2148477 | Exploit Issue Tracking Patch Third Party Advisory |
| https://security.openstack.org/ossa/OSSA-2026-015.html | Patch Vendor Advisory |
| https://access.redhat.com/security/cve/CVE-2026-43000 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2482826 | |
| https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43000.json |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43000 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43000
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43000 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43000 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 23, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:openstack:13'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 13 (Queens)', 'packageName': 'rhosp13/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'packageName': 'rhosp-rhel8/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'packageName': 'rhosp-rhel9/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'packageName': 'rhoso/openstack-keystone-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:openstack:13'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 13 (Queens)', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:13'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 13 (Queens)', 'packageName': 'rhosp13/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'packageName': 'rhosp-rhel8/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'packageName': 'rhosp-rhel9/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'packageName': 'rhoso/openstack-keystone-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:openstack:13'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 13 (Queens)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:openstack:13'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 13 (Queens)', 'packageName': 'rhosp13/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'packageName': 'rhosp-rhel8/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'packageName': 'rhosp-rhel9/openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'packageName': 'openstack-keystone', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'packageName': 'rhoso/openstack-keystone-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:openstack:13'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 13 (Queens)', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:16.2'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 16.2', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:17.1'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 17.1', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:openstack:18.0'], 'vendor': 'Red Hat', 'product': 'Red Hat OpenStack Platform 18.0', 'defaultStatus': 'affected'}] Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L Added CWE CWE-266 Added Reference https://access.redhat.com/security/cve/CVE-2026-43000 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2482826 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43000.json -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-43000', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-05-28T19:41:32.071988Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'OpenStack', 'product': 'Keystone', 'versions': [{'status': 'affected', 'version': '14.0.0', 'lessThan': '27.0.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '28.0.0', 'lessThan': '28.0.2', 'versionType': 'semver'}, {'status': 'affected', 'version': '29.0.0', 'lessThan': '29.0.2', 'versionType': 'semver'}], 'defaultStatus': 'unaffected'}] -
Initial Analysis by [email protected]
Jun. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CPE Configuration OR *cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:* versions from (including) 28.0.0 up to (excluding) 28.0.2 *cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:* versions from (including) 29.0.0 up to (excluding) 29.0.2 *cpe:2.3:a:openstack:keystone:*:*:*:*:*:*:*:* versions from (including) 14.0.0 up to (excluding) 27.0.2 Added Reference Type MITRE: https://bugs.launchpad.net/keystone/+bug/2148477 Types: Exploit, Issue Tracking, Patch, Third Party Advisory Added Reference Type MITRE: https://security.openstack.org/ossa/OSSA-2026-015.html Types: Patch, Vendor Advisory -
New CVE Received by [email protected]
May. 28, 2026
Action Type Old Value New Value Added Description An issue was discovered in OpenStack Keystone before 29.0.2. When combined with an application credential impersonation vulnerability, an attacker with the member role on a project can escalate to admin by chaining unrestricted application credentials with Keystone trusts. The impersonated token carries the victim's identity, which passes the trustor validation check. Keystone then validates the delegated roles against the victim's actual role assignments in the database, not the roles on the requesting token. This allows the attacker to create a trust delegating the victim's admin role to themselves. The trust persists independently, and additional trusts and application credentials can be created to maintain access. All actions are logged under the victim's identity. Added CVSS V3.1 AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L Added CWE CWE-863 Added Reference https://bugs.launchpad.net/keystone/+bug/2148477 Added Reference https://security.openstack.org/ossa/OSSA-2026-015.html
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.