keystone — security advisory
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.
- Products
- keystone
- Affected versions
- 2:22.0.0-2, 2:22.0.2-0+deb12u1, 2:22.0.2-0+deb12u2, 2:27.0.0-3, 2:27.0.0-3+deb13u1, 2:27.0.0-3+deb13u3, 2:28.0.0-1, 2:28.0.0-2, 2:28.0.0-3, 2:28.0.0-4, 2:28.0.0-5, 2:28.0.0-6, 2:28.0.0~rc1-1, 2:28.0.0~rc1-2, 2:28.0.0~rc1-4, 2:29.0.0-1, 2:29.0.0-2, 2:29.0.0-3, 2:29.0.0~rc1-1, 2:29.0.0~rc1-2, 2:29.0.1-1
- Fixed versions
- 2:22.0.2-0+deb12u3, 2:27.0.0-3+deb13u4, 2:29.0.1-2
- CVEs
- CVE-2026-43000
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:48 UTC · Revision 2
Source evidence
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.
osv:DEBIAN-CVE-2026-43000
keystone
Fixed versions: 2:22.0.2-0+deb12u3
keystone
Fixed versions: 2:27.0.0-3+deb13u4
keystone
Fixed versions: 2:29.0.1-2
Complete source record
{
"id": "5c2cd4fb88164aa95c9e0553edb3f9ded78c308d1d69c449fd9298118c8afb1c",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-43000",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-43000",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2026-43000",
"products": [
{
"name": {
"value": "keystone",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:22.0.2-0+deb12u3",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "2:22.0.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "2:22.0.2-0+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "2:22.0.2-0+deb12u2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "keystone",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:27.0.0-3+deb13u4",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "2:27.0.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "2:27.0.0-3+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "2:27.0.0-3+deb13u3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "keystone",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "2:29.0.1-2",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "2:27.0.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0-4",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0-5",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0-6",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0~rc1-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0~rc1-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:28.0.0~rc1-4",
"evidence": "/affected/2/versions"
},
{
"value": "2:29.0.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:29.0.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:29.0.0-3",
"evidence": "/affected/2/versions"
},
{
"value": "2:29.0.0~rc1-1",
"evidence": "/affected/2/versions"
},
{
"value": "2:29.0.0~rc1-2",
"evidence": "/affected/2/versions"
},
{
"value": "2:29.0.1-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-43000",
"aliases": [
"DEBIAN-CVE-2026-43000"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:22.0.2-0+deb12u3"
}
]
}
],
"package": {
"name": "keystone",
"purl": "pkg:deb/debian/keystone?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"2:22.0.0-2",
"2:22.0.2-0+deb12u1",
"2:22.0.2-0+deb12u2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:27.0.0-3+deb13u4"
}
]
}
],
"package": {
"name": "keystone",
"purl": "pkg:deb/debian/keystone?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"2:27.0.0-3",
"2:27.0.0-3+deb13u1",
"2:27.0.0-3+deb13u3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "2:29.0.1-2"
}
]
}
],
"package": {
"name": "keystone",
"purl": "pkg:deb/debian/keystone?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"2:27.0.0-3",
"2:28.0.0-1",
"2:28.0.0-2",
"2:28.0.0-3",
"2:28.0.0-4",
"2:28.0.0-5",
"2:28.0.0-6",
"2:28.0.0~rc1-1",
"2:28.0.0~rc1-2",
"2:28.0.0~rc1-4",
"2:29.0.0-1",
"2:29.0.0-2",
"2:29.0.0-3",
"2:29.0.0~rc1-1",
"2:29.0.0~rc1-2",
"2:29.0.1-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-43000.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:42.308513189Z",
"provider": "osv",
"upstream": [
"CVE-2026-43000"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-43000"
]
},
"related_cves": [
{
"value": "CVE-2026-43000",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 461216,
"published_at": "2026-05-28T19:16:37.773+00:00"
}