OpenStack Keystone up to 27.0.1/28.0.1/29.0.1 authorization

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in OpenStack Keystone up to 27.0.1/28.0.1/29.0.1. The impacted element is an unknown function. The manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-43000. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenStack Keystone up to 27.0.1/28.0.1/29.0.1. It has been rated as problematic. This issue affects an unknown functionality. The manipulation with an unknown input leads to a authorization vulnerability. Using CWE to declare the problem leads to CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at bugs.launchpad.net. The identification of this vulnerability is CVE-2026-43000 since 05/01/2026. The exploitation is known to be difficult. The attack may be initiated remotely. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 321365 (Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : OpenStack Keystone vulnerabilities (USN-8433-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 27.0.2, 28.0.2 or 29.0.2 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (321365). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 8.8
NVD Vector: 🔒

CNA Base Score: 6.0
CNA Vector (MITRE): 🔒

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authorization
CWE: CWE-863 / CWE-285 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321365
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : OpenStack Keystone vulnerabilities (USN-8433-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Keystone 27.0.2/28.0.2/29.0.2

Timelineinfo

05/01/2026 CVE reserved
05/28/2026 +27 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
07/03/2026 +35 days VulDB entry last update

Sourcesinfo

Vendor: openstack.org

Advisory: bugs.launchpad.net
Status: Confirmed

CVE: CVE-2026-43000 (🔒)
GCVE (CVE): GCVE-0-2026-43000
GCVE (VulDB): GCVE-100-366857

Entryinfo

Created: 05/28/2026 22:22
Updated: 07/03/2026 01:50
Changes: 05/28/2026 22:22 (63), 06/19/2026 18:01 (2), 07/03/2026 01:50 (11)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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