CVE-2026-42998: [OSSA-2026-015] OpenStack Keystone: Multiple cdential delegation and authorization bypass vulnerabilities (CVE-2026-42998, CVE-2026-42999, CVE-2026-43000, CVE-2026-43001, CVE-2026-44394)

Published May 28, 2026
·
Updated

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.

Affected Software

5 affected componentsFixes available
Openstack Keystone<29.0.2
Openstack Keystone>=14.0.0<27.0.2
Openstack Keystone>=28.0.0<28.0.2
Openstack Keystone>=29.0.0<29.0.2
debian/keystone<=2:18.0.0-3+deb11u1, <=2:22.0.2-0+deb12u1, <=2:27.0.0-3+deb13u1
2:18.1.0-1+deb11u32:22.0.2-0+deb12u32:27.0.0-3+deb13u42:29.0.1-2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/keystone to a version that resolves this vulnerability.

    Fixed in 2:18.1.0-1+deb11u3Fixed in 2:22.0.2-0+deb12u3Fixed in 2:27.0.0-3+deb13u4Fixed in 2:29.0.1-2
  2. Upgrade

    Upgrade debian/keystone to a version that resolves this vulnerability.

    Fixed in 2:18.1.0-1+deb11u3
  3. Upgrade

    Upgrade debian/keystone to a version that resolves this vulnerability.

    Fixed in 2:22.0.2-0+deb12u3
  4. Upgrade

    Upgrade debian/keystone to a version that resolves this vulnerability.

    Fixed in 2:27.0.0-3+deb13u4
  5. Upgrade

    Upgrade debian/keystone to a version that resolves this vulnerability.

    Fixed in 2:29.0.1-2
  6. Upgrade

    Upgrade openstack/keystone to a version that resolves this vulnerability.

    Fixed in 29.0.2
  7. Upgrade

    Upgrade debian/keystone to a version that resolves this vulnerability.

    Patch OSSA-2026-015

Event History

May 28, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
Jun 16, 2026
Data Sourced
via Ubuntu·08:40 PM
RemedyDescriptionSeverityAffected Software
Data Sourced
via Launchpad·08:41 PM
Description
Data Sourced
via Debian·08:41 PM
DescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-42998?

The severity of CVE-2026-42998 is classified as medium with a score of 6.

2

How do I fix CVE-2026-42998?

To fix CVE-2026-42998, upgrade OpenStack Keystone to version 29.0.2 or later.

3

What type of vulnerability is CVE-2026-42998?

CVE-2026-42998 involves credential delegation and authorization bypass vulnerabilities.

4

What can an attacker do with CVE-2026-42998?

An attacker can authenticate using their own application credentials without verifying ownership.

5

Which version of OpenStack is affected by CVE-2026-42998?

OpenStack Keystone versions before 29.0.2 are affected by CVE-2026-42998.

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