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CVE-2025-66406

Improper Authorization Check for SSH Certificate Revocation

MEDIUM
5
CVSS Score
Published: December 3, 2025 at 07:13 PM UTC
Updated: October 18, 2026 at 05:10 PM UTC
1 product affected across 1 vendorStep CA

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Severity
MEDIUM5
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Step CA· Smallstepgo
90%
v < 0.29.0
Affected range stops below 0.29.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRM
Source: cverecord
https://github.com/smallstep/certificates/security/advisories/GHSA-j7c9-79x7-8hpr

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
HIGH
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
HIGH
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-863

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