Skip to content
Fencer Vulns
high 8.4

CVE-2026-43000 json

OpenStack Keystone has an Incorrect Authorization issue

published 2026-05-28 5 mo ago modified 2026-10-26 14 d ago also GHSA-q623-f4j4-p4xj , PYSEC-2026-601 , EUVD-2026-33242

cvss
8.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

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.

Patch / fix

  • pypi keystone 27.0.2, 28.0.2, 29.0.2
  • OpenStack Keystone 27.0.2, 28.0.2, 29.0.2
  • keystone Debian 12 2:22.0.2-0+deb12u3
  • keystone Debian 13 2:27.0.0-3+deb13u4
  • keystone Debian 14 2:29.0.1-2

debian advisories DEBIAN-CVE-2026-43000

  • keystone Ubuntu 22.04 LTS 2:21.0.1-0ubuntu2.4
  • keystone Ubuntu 24.04 LTS 2:25.0.0-0ubuntu1.4
  • keystone Ubuntu 25.10 2:28.0.0-0ubuntu1.3
  • keystone Ubuntu 26.04 LTS 2:29.0.0-0ubuntu1.2

ubuntu advisories UBUNTU-CVE-2026-43000

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-43000 updated cvss 8.4

keystone: OpenStack Keystone: Privilege escalation via chained application credential impersonation and trust misuse

  • Red Hat OpenStack Platform 16.2 python3-keystone, openstack-keystone, rhosp-rhel8/openstack-keystone Red Hat OpenStack Platform 17.1 python3-keystone, openstack-keystone, rhosp-rhel9/openstack-keystone Red Hat OpenStack Platform 18.0 openstack-keystone, rhoso/openstack-keystone-rhel9
    affected: no fix available
  • Red Hat OpenStack Platform 13.0 - ELS python-keystone 13.0.4-10.el7ost, openstack-keystone 13.0.4-10.el7ost
    fixed: vendor fix RHSA-2026:94039
  • Red Hat OpenStack Platform 13.0 - ELS python-webob 1.7.2-2.el7ost, python-nova 17.0.13-43.el7ost, openstack-heat 10.0.3-21.el7ost, openstack-nova 17.0.13-43.el7ost, openstack-heat-api 10.0.3-21.el7ost, python-nova-tests 17.0.13-43.el7ost, +18 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/keystone/+bug/2148477 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
CISA ADP 3.1 8.4 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 8.4 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
GitHub 3.1 6.0 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:L/A:L
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
pypi keystone
>=14.0.0, <27.0.2
>=28.0.0, <28.0.2
>=29.0.0, <29.0.2
27.0.2
28.0.2
29.0.2

Affected products

  • OpenStack Keystone
  • Red Hat Red Hat OpenStack Platform 13 (Queens)
  • Red Hat Red Hat OpenStack Platform 16.2
  • Red Hat Red Hat OpenStack Platform 17.1
  • Red Hat Red Hat OpenStack Platform 18.0

Classification

Weakness
  • CWE-863 Incorrect Authorization
  • CWE-266 Incorrect Privilege Assignment

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.