OpenStack Keystone up to 27.0.1/28.0.1/29.0.1 Authentication Plugin authorization

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in OpenStack Keystone up to 27.0.1/28.0.1/29.0.1. Affected by this vulnerability is an unknown functionality of the component Authentication Plugin Handler. Such manipulation leads to authorization. This vulnerability is uniquely identified as CVE-2026-42998. The attack can be launched remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in OpenStack Keystone up to 27.0.1/28.0.1/29.0.1 and classified as problematic. Affected by this issue is some unknown functionality of the component Authentication Plugin Handler. 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. CVE summarizes:

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

The advisory is shared for download at bugs.launchpad.net. This vulnerability is handled as CVE-2026-42998 since 05/01/2026. The exploitation is known to be difficult. The attack may be launched remotely. There are neither technical details nor an exploit 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). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

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

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
06/19/2026 +22 days VulDB entry last update

Sourcesinfo

Vendor: openstack.org

Advisory: bugs.launchpad.net
Status: Confirmed

CVE: CVE-2026-42998 (🔒)
GCVE (CVE): GCVE-0-2026-42998
GCVE (VulDB): GCVE-100-366872

Entryinfo

Created: 05/28/2026 22:27
Updated: 06/19/2026 18:01
Changes: 05/28/2026 22:27 (64), 06/19/2026 18:01 (2)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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