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CVE-2026-43001

Openstack Keystone broken access control

7.9 HIGHPublic exploitEPSS 0.59%
  1. Published1 May 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityHigh
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityLow
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L

Affected products

Openstack Keystone≥ 14.0.0 < 27.0.2 · ≥ 28.0.0 < 28.0.2 · ≥ 29.0.0 < 29.0.2

Remediation

Fixed in
Openstack Keystone≥ 27.0.2

References

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Frequently asked

Is CVE-2026-43001 being actively exploited?

CVE-2026-43001 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.59%.

How severe is CVE-2026-43001?

CVE-2026-43001 has a CVSS 3.1 base score of 7.9, rated high. EPSS estimates a 0.59% probability of exploitation.

Which products are affected by CVE-2026-43001?

Affected products include Openstack Keystone.

How do I fix CVE-2026-43001?

Upgrade affected software to a fixed version, for example Openstack Keystone 27.0.2 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-43001 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.