BaseFortify

Publication date: 2025-12-03

Last updated on: 2025-12-04

Assigner: GitHub, Inc.

Description

Step CA is an online certificate authority for secure, automated certificate management for DevOps. Prior to 0.29.0, there is an improper authorization check for SSH certificate revocation. This affects deployments configured with the SSHPOP provisioner. This vulnerability is fixed in 0.29.0.

CVSS Scores

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Meta Information

Published

2025-12-03

Last Modified

2025-12-04

Generated

2026-07-06

AI Q&A

2025-12-03

EPSS Evaluated

2026-07-05

NVD

CVE-2025-66406

Affected Vendors & Products

Vendor	Product	Version / Range
smallstep	step_ca	0.28.4

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

This vulnerability in Step CA, prior to version 0.29.0, involves an improper authorization check for SSH certificate revocation when using the SSHPOP provisioner. This means that the system may allow unauthorized actions related to revoking SSH certificates, potentially leading to security issues. The vulnerability is fixed in version 0.29.0.

Impact Analysis

The vulnerability can impact you by allowing improper authorization in SSH certificate revocation, which could lead to unauthorized revocation or failure to revoke SSH certificates properly. This may result in denial of service or disruption of SSH access, affecting availability and integrity of systems relying on these certificates.

Mitigation Strategies

Upgrade Step CA to version 0.29.0 or later, as this version includes the fix for the improper authorization check for SSH certificate revocation affecting deployments using the SSHPOP provisioner.

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