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Vulnerability · Published May 1, 2026 · Assigned by mitre

CVE-2026-43001

High 7.9

In plain English

A high-severity incorrect authorization in Keystone from OpenStack. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.9High
Exploit odds (30 days)0.5%top 59.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12keystone2:22.0.2-0+deb12u3DEBIAN-CVE-2026-43001
Debian:13keystone2:27.0.0-3+deb13u4DEBIAN-CVE-2026-43001
Debian:14keystone2:29.0.1-2DEBIAN-CVE-2026-43001
PyPIkeystoneno fix listedGHSA-hhq2-3832-xxcv
PyPIkeystone27.0.2, 28.0.2, 29.0.2PYSEC-2026-602
Ubuntu:22.04:LTSkeystone2:21.0.1-0ubuntu2.4UBUNTU-CVE-2026-43001
Ubuntu:24.04:LTSkeystone2:25.0.0-0ubuntu1.4UBUNTU-CVE-2026-43001
Ubuntu:25.10keystone2:28.0.0-0ubuntu1.3UBUNTU-CVE-2026-43001
Ubuntu:26.04:LTSkeystone2:29.0.0-0ubuntu1.2UBUNTU-CVE-2026-43001

Affected products (as reported)

VendorProductVersions
OpenStack Keystone 14.0.0 – before 27.0.228.0.0 – before 28.0.229.0.0 – before 29.0.2

Weakness: CWE-863, CWE-1288 · Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

References