CVE-2026-43000
highpriority · track · 35OT risk · elevatedEPSS 0.003 · 26 %ileEUUSEPSS · scored 2026-10-27
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.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6–8.8
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (9)
Products and version ranges known to be affected.
advisories (2)
Vendor and ecosystem advisories describing this.
- GHSA-q623-f4j4-p4xjOpenStack Keystone has an Incorrect Authorization issue2026-05-28ghsa · osvUS
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.
- PYSEC-2026-6012026-05-28vendor · osvUS
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.
also known as (6)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (9)
External citations — patches, advisories, analysis.
- https://bugs.launchpad.net/keystone/+bug/2148477cnnvd
- https://security.openstack.org/ossa/OSSA-2026-015.htmlcnnvd
- https://bugs.launchpad.net/keystone/+bug/2148477enisa_euvd
- https://security.openstack.org/ossa/OSSA-2026-015.htmlenisa_euvd
- https://access.redhat.com/security/cve/CVE-2026-43000nvd
- https://bugs.launchpad.net/keystone/+bug/2148477ExploitIssue TrackingPatchThird Party Advisorynvd
- https://bugzilla.redhat.com/show_bug.cgi?id=2482826nvd
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43000.jsonnvd
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