CVE-2026-42998

HIGH EPSS 22.0%
Published May 28, 20261mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 3.1
High
Find Similar
Published May 28, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
22.0% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-863 Incorrect Authorization Authorization

Affected Products 3

VendorProductVersionRange
openstackkeystone*≥14.0.0  –  <27.0.2
openstackkeystone*≥28.0.0  –  <28.0.2
openstackkeystone*≥29.0.0  –  <29.0.2

References 2

  • bugs.launchpad.net https://bugs.launchpad.net/keystone/+bug/2148477
    ExploitIssue TrackingPatchThird Party Advisory
  • security.openstack.org https://security.openstack.org/ossa/OSSA-2026-015.html
    PatchVendor Advisory

Remediation

  • bugs.launchpad.net https://bugs.launchpad.net/keystone/+bug/2148477
    ExploitIssue TrackingPatchThird Party Advisory
  • security.openstack.org https://security.openstack.org/ossa/OSSA-2026-015.html
    PatchVendor Advisory