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Fencer Intel
medium 6.0

CVE-2026-42998 json

OpenStack Keystone doesn't verify that the user supplied in the authentication request matches the owner of the application credential

published 5mo ago modified 14d ago also GHSA-8f8m-wrvr-wcvf , PYSEC-2026-599 , EUVD-2026-33240

cvss
6.0
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 23%
public exploits
0
none known

Summary

An issue was discovered in OpenStack Keystone before 29.0.2. The Keystone application credential authentication plugin does not verify that the user supplied in the authentication request matches the owner of the application credential. An attacker can authenticate with their own application credential ID and secret while specifying a different user's name and domain in the request body. Keystone issues a token attributed to the victim user. The impersonated token is project-scoped and carries the intersection of the application credential's roles and the victim's actual roles on the project. This enables audit evasion, reading the victim's credentials, and acting as the victim within shared projects.

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-2026-42998

  • 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-2026-42998

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

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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-2026-42998 updated cvss 4.9

openstack-keystone: OpenStack Keystone: User impersonation and unauthorized access via insufficient application credential verification.

  • Red Hat OpenStack Platform 13 (Queens) rhosp13/openstack-keystone 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 “Fix deferred”

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
5mo ago

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-09).

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
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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

Classification

Weakness

References

Sources

Fencer Intel 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.