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Review reviewHigh

CVE-2026-43001

OpenStack Keystone, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2

An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.

CVSS
8
EPSS
0.46%
37.3% percentile
CISA KEV
Not listed
Published
2026.05.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.46%
Technical severityCVSS 8

Vulnerability overview

An issue was discovered in OpenStack Keystone before 29.0.2. POST /v3/credentials did not validate that the caller-supplied project_id for an EC2-type credential matched the project of the authenticating application credential. This allowed an attacker holding an unrestricted application credential for project A to create an EC2 credential targeting project B; a subsequent /v3/ec2tokens exchange would then issue a Keystone token scoped to project B while still carrying the original app_cred_id, enabling cross-project lateral movement within the credential owner's role footprint.

Affected product and versions

Product
OpenStack Keystone, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2
Affected versions
>= 14.0.0 < 27.0.2, >= 28.0.0 < 28.0.2, >= 29.0.0 < 29.0.2
Fixed versions
27.0.2, 28.0.2, 29.0.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that OpenStack Keystone, Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-1288, CWE-863