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CVE-2026-43000

6.0 · MEDIUM

An issue was discovered in OpenStack Keystone before 29.0.2.

Published May 28, 2026CWE-863EPSS 0.43%

Overview

CVE-2026-43000 is a medium-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 6.0 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugs.launchpad.net/keystone/+bug/2148477Refsecurity.openstack.org/ossa/OSSA-2026-015.htmlRefaccess.redhat.com/security/cve/CVE-2026-43000Refbugzilla.redhat.com/show_bug.cgi?id=2482826Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43000.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-43000?

CVE-2026-43000 is a medium-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 6.0 (MEDIUM).

How severe is CVE-2026-43000?

This vulnerability has a CVSS 3.1 base score of 6.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-43000?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-43000?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-43000 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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