CVE-2026-43001Network attack vector

Cross-project token issuance via mismatched project identifiers

Published May 1, 2026 · Updated May 1, 2026

Incorrect authorization in OpenStack Keystone before 29.0.2 allows remote authenticated users to obtain tokens for other projects. POST /v3/credentials accepts a caller-supplied project_id for an EC2 credential without verifying that it matches the authenticating application credential's project. An unrestricted application credential is required; exchanging the forged EC2 credential at /v3/ec2tokens grants the credential owner's roles in the targeted project.

CVSS severity8.0
High
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in OpenStack Keystone before 29.0.2 allows remote authenticated users to obtain tokens for other projects. POST /v3/credentials accepts a caller-supplied project_id for an EC2 credential without verifying that it matches the authenticating application credential's project. An unrestricted application credential is required; exchanging the forged EC2 credential at /v3/ec2tokens grants the credential owner's roles in the targeted project.

The record

CVE
CVE-2026-43001
Published
May 1, 2026
Updated
May 1, 2026
Vendor
OpenStack
Product
Keystone
Classifications
CWE-1288, CWE-863, T1078.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2026CVE publishedPublication date reported by the CVE source.
  2. May 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13 <=29

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenStack · Keystoneversion=13 <=29

Published CVSS scores

7.9MITRECVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:L
8.0NIST NVDCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
8.0redhat-SADPCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1288Improper Validation of Consistency within Input
CWE-863Incorrect Authorization
T1078.004Valid Accounts: Cloud Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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