{"cve":"CVE-2026-43000","nvd":{"published":"2026-05-28T19:16:37.773","modified":"2026-10-26T13:10:00.140","status":"Modified","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":["CWE-863","CWE-266"],"references":["https://bugs.launchpad.net/keystone/+bug/2148477","https://security.openstack.org/ossa/OSSA-2026-015.html","https://access.redhat.com/security/cve/CVE-2026-43000","https://bugzilla.redhat.com/show_bug.cgi?id=2482826","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43000.json"],"products":["openstack:keystone"],"source":"nvd","synced_at":"2026-10-26T13:39:24.642594360+00:00"},"epss":{"cve":"CVE-2026-43000","score":0.00328,"percentile":0.2562,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-q623-f4j4-p4xj","url":"https://osv.dev/vulnerability/GHSA-q623-f4j4-p4xj","summary":"OpenStack Keystone has an Incorrect Authorization issue","modified":"2026-09-10T03:51:06.876418993Z","packages":[{"ecosystem":"PyPI","name":"keystone","purl":"pkg:pypi/keystone","ranges":[">=14.0.0 <27.0.2"],"fixed":["27.0.2"]},{"ecosystem":"PyPI","name":"keystone","purl":"pkg:pypi/keystone","ranges":[">=28.0.0 <28.0.2"],"fixed":["28.0.2"]},{"ecosystem":"PyPI","name":"keystone","purl":"pkg:pypi/keystone","ranges":[">=29.0.0 <29.0.2"],"fixed":["29.0.2"]}]},{"id":"PYSEC-2026-601","url":"https://osv.dev/vulnerability/PYSEC-2026-601","summary":"","modified":"2026-07-13T16:45:07.805140152Z","packages":[{"ecosystem":"PyPI","name":"keystone","purl":"pkg:pypi/keystone","ranges":[">=14.0.0 <27.0.2",">=28.0.0 <28.0.2",">=29.0.0 <29.0.2"],"fixed":["27.0.2","28.0.2","29.0.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}