What’s Vulnerable › Vulnerabilities

CVE-2026-43001

• Severity: high (CVSS 8.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-05-01 · updated 2026-10-26
• Weakness: CWE-863

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 products

• OpenStack Keystone: from 14.0.0 before 27.0.2; from 28.0.0 before 28.0.2; from 29.0.0 before 29.0.2 — fixed in 27.0.2, 28.0.2, 29.0.2

How to fix

Upgrade to a fixed version: OpenStack Keystone 27.0.2, 28.0.2, 29.0.2. Check the vendor advisory for mitigations.

References

• https://bugs.launchpad.net/keystone/+bug/2149775
• https://review.opendev.org/c/openstack/keystone/+/985804
• https://security.openstack.org/ossa/OSSA-2026-015.html
• https://access.redhat.com/errata/RHSA-2026:39808
• https://access.redhat.com/errata/RHSA-2026:54757
• https://access.redhat.com/security/cve/CVE-2026-43001
• https://bugzilla.redhat.com/show_bug.cgi?id=2464305
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43001.json

Get alerted when CVE-2026-43001 or the next vulnerability affects your stack